Curious to know how the two more extreme wings of the Democrats and Republicans in the House differ, I asked a high-ranking Republican staff member with decades of government experience — who requested anonymity in order to speak openly — for his take:They are different in that Alexandria Ocasio-Cortez and the “Squad” seem to me to be more “idealist.” They actually do want to legislate/accomplish the very far-left social ideas they propose. They are willing to cause Pelosi headaches, but they have shown they are not going to go so far as to jeopardize the government (operations) and safety net that so many families depend on from a working government.On the other hand, the staff member continued,I hate to use a loaded word here but I can’t think of another one, the “MAGA Caucus” members operate more like bullies — legislative bullies. If they have the opportunity, they will gladly hold bills/government funding hostage for the sake of populism and social media. They would take pride in “shooting the hostage” as that would be very popular with their tribal base and their social media.Both blocs have thrived in an era of social media and small-dollar funding, skilled in winning publicity, often shaping public perceptions of partisan competition on Capitol Hill. In this respect, the Squad and the MAGA caucus have come to epitomize partisan hostility, the refusal of the parties to cooperate, and, more broadly, the intense political polarization that afflicts America today.The Squad and the MAGA caucus are best known for their most visible members, Ocasio-Cortez, Democrat of New York, and Marjorie Taylor Greene, Republican of Georgia.Both factions have caused major headaches for their respective party leaders.Centrist Democrats contend — citing poll data from USA Today Ipsos, Pew Research, a FiveThirtyEight polling summary and the University of Massachusetts-Amherst Survey — that support from members of the Squad and their allies for defunding the police has undermined the re-election chances of moderate House Democrats running in purple districts.The participation of members of the MAGA caucus in events linked to white supremacists have increased the vulnerability of the Republican Party to charges of racism, alienating moderate suburban voters.But these are hardly equivalent in the first place, and there are other, major dissimilarities.John Lawrence, who retired in 2013 as chief of staff for the House speaker, Nancy Pelosi, took a position to my Republican informant’s in his email contrasting the two blocs:The MAGA people seem far more focused on personal celebrity and staking out extremist stances whereas the Squad, while pushing the policy envelope to some extent, remain reliable party members.The difference, Lawrence argued,comes from a fundamental distinction between the parties at this point in history: Democrats approach government as an agent of making public policy across a wide swath of subjects whereas Republicans — and the MAGA people are the extreme example of this — not only have a very hostile view of government but embrace inaction (and therefore obstruction), especially at the national level.Here are some examples that illuminate the differences to which the political veterans I spoke to were referring.In a widely publicized struggle that continued for over two months in the fall of 2021, the Squad, along with the House Progressive Caucus, held the $1.2 trillion Infrastructure Investment and Jobs Act, a centerpiece of the Biden agenda, hostage in order to force House Democrats to pass a separate but more controversial measure, the $2.2 trillion Build Back Better bill (for spending on education, the environment, health care and in other areas).The tactic worked — in part. On Nov. 15, the House and Senate both voted to enact, and send to President Biden, the $1.2 trillion infrastructure bill — with the support of a majority of the Progressive Caucus. Four days later, the House approved the $2.2 trillion Build Back Better bill by a slim vote (220-213). Although House Democratic leaders kept their promise to pass the $2.2 trillion Build Back Better bill, it remains stalled in the Senate as negotiations between the administration and Senator Joe Manchin of West Virginia, who at times allies himself with the Republican Party, have failed to bear fruit.Compare that lengthy struggle, to which the Squad lent its strength, to the more frivolous votes cast by members of the Republican MAGA caucus — not a formal organization in the manner of the Progressive Caucus but a loose collection of representatives on the hard right.On May 18, the House voted 414-9 to pass the Access to Baby Formula Act, which would authorize the Department of Agriculture “to waive certain requirements so that vulnerable families can continue purchasing safe infant formula with their WIC (the Special Supplemental Nutrition Program for Women, Infants, and Children).”Who cast the nine votes against the infant formula bill? The core of the MAGA caucus: House Republican Representatives Andy Biggs of Arizona, Lauren Boebert of Colorado, Matt Gaetz of Florida, Louie Gohmert of Texas, Paul Gosar of Arizona, Marjorie Taylor Greene of Georgia, Clay Higgins of Louisiana, Thomas Massie of Kentucky and Chip Roy of Texas.Or take the House vote last year to fast-track visas for Afghans who provided crucial assistance to the U.S. military, which went 407-16. “Those Afghans knew the risk that their service posed to them and their families, and yet they signed up to help because they believed that we would have their back,” Representative Jason Crow, Democrat of Colorado, told the House. “They have earned a path to safety.”Who cast the 16 no votes? Five of the nine who voted against the baby formula bill — Biggs, Boebert, Gosar, Greene and Roy, plus Mo Brooks, Scott DesJarlais, Jeff Duncan, Bob Good, Kevin Hern, Jody Hice, Barry Moore, Scott Perry, Bill Posey and Matt Rosendale.Philip Bump, a Washington Post reporter, has covered what he calls the “Nay caucus,” writing “The emerging far-right ‘no’ caucus in the House” on March 19, 2021; “What’s the unifying force behind the House’s far-right ‘nay’ caucus?” on June 16, 2021; and “The House Republican ‘no’ caucus is at it again” on April 6, 2022.In his most recent article, Bump wrote:Perhaps the best description of this group is that it constitutes a highly pro-Trump, deeply conservative and often individualistic subset of a very pro-Trump, very conservative and very individualistic Republican caucus. It is a group that includes a number of legislators who go out of their way to draw attention to themselves; one way to do so is to oppose overwhelmingly popular measures.Bump ranked members of this caucus on the basis of voting no on a roll-callin which no more than a tenth of the House cast a vote in opposition. The top ten were Massie, who cast 99 such votes, Roy 93, Biggs 85, Greene 79, Ralph Norman 73, Good 57, Rosendale 56, Boebert 56, Matt Gaetz 51 and Perry 49.Members of the MAGA caucus have been sharply critical of the Squad, to put it mildly. In November 2021, Gosar posted an animated video in which, as CNN put it, he is “portrayed as a cartoon anime-type hero and is seen attacking a giant with Ocasio-Cortez’s face with a sword from behind. The giant can then be seen crumbling to the ground.”Gosar issued a statement defending the video, which shows the cartoon image of himself flying by jetpack to slay the giant Ocasio-Cortez: “The cartoon depicts the symbolic nature of a battle between lawful and unlawful policies and in no way intended to be a targeted attack against Representative Cortez,” it says, before adding, “It is a symbolic cartoon. It is not real life. Congressman Gosar cannot fly.”Ruth Bloch Rubin, a political scientist at the University of Chicago, outlined in an email the differences between the Squad and the MAGA caucus:There are a lot of ways that lawmakers can be extreme. They can be extremist in their policy preferences, extremist in their preferred tactics, and extremist in their political messaging. When it comes to policy, it isn’t exactly clear what folks like Greene and Gosar want — they aren’t exactly policy wonks. Members of the Squad have done more to communicate their policy priorities — e.g., on issues like policing and climate change — and there, what they want is generally more liberal than what some (perhaps many) in the party are likely to support.In terms of political messaging, Rubin argued, “it is undeniable that Greene and Gosar have done more to deviate from normal politics — likening vaccination requirements to Nazi rule or running violent ad campaigns — than anything ever said by any member of the Squad.”I asked Rubin which group has done more damage to its own party:If/when the Democrats lose big in the midterms, I think it likely that the Squad will face a lot of criticism for pushing progressive policies that are not sufficiently popular with voters (police reform) over those that have greater public support (expanding Medicare, for example).But, Rubin contended, Biden will also bear responsibility if Democrats suffer badly in November:In this day and age, it is unreasonable to expect that you can be an FDR-figure without the kind of sizable and stable majorities in Congress he benefited from. The upshot of being an experienced politicians is that you should anticipate this and plan accordingly.Conversely, Rubin continued:There is little evidence that Republicans like Gosar and Greene are doing any short-term damage to the Republican Party — long-term damage is less clear. And one way we can tell is that Republican leaders (and voters) wasted no time getting rid of the one member whose conduct wasn’t burnishing the party’s brand: Madison Cawthorne. The fact that this hasn’t happened to Greene or Gosar or other MAGAish members suggests they aren’t perceived to be enough of a problem.Frances Lee, a political scientist at Princeton, argued in an email that extremists can in fact play a constructive role in legislative proceedings:While not defending the excesses and demagoguery that some of the members you list have engaged in, a couple examples come to mind:Massie has strenuously objected to the continued use of proxy voting in Congress two+ years into the pandemic as undermining the traditions and character of the institution. For those of us who have long worried about the huge share of members who are only in Washington from Tuesday to Thursday, are such perspectives out of bounds?Was there any value in Massie’s insistence on holding public debate before Congress passed the $2.2 trillion CARES Act, a stance that drew harsh denunciation from President Trump himself?Lee acknowledged:Members who incite violence against other members or the institution cannot be countenanced. But I would encourage a tolerant attitude toward legitimately elected representatives, even those who hold views far outside the mainstream. It’s always worth considering what their constituents see in them and what, if anything, they contribute to debate. Such members do make Congress a more fully representative body.Michael B. Levy, who served as chief of staff to former Senator Lloyd Bentsen, Democrat of Texas, pointed out, “There are many similarities in that both groups live and die by their primaries because their districts are one-party districts and neither has to worry much about the median voter in their states.”Beyond that, Levy continued, there are significant differences: “The Squad’s agenda is a basic international social democratic left agenda which joins an expanding social welfare state to an expanding realm of cultural liberalism and identity politics.”The Squad, Levy wrote, “while willing to attack members of their own party and support candidates in primaries running against incumbents in their own party, continues to exhibit loyalty to basic democratic norms in the system at large.”In contrast, Levy argued, “The MAGA caucus has a less coherent ideology, even if it has a very distinct angry populist tone.” That may be temporary, Levy suggested,as more and more intellectuals try to create a type of coherent “integralist” ideology joining protectionism, cultural and religious traditionalism, and an isolationist but nationalist foreign policy. Arguably theirs is also a variant of identity politics, but that is less clearly articulated. As best I can tell, they do not have a coherent approach to economic policy or the welfare state.Two scholars who have been highly critical of developments in the Republican Party, Norman Ornstein of the American Enterprise Institute and Thomas Mann of the Brookings Institution, co-authors of the book “It’s Even Worse Than It Looks: How the American Constitutional System Collided With the New Politics of Extremism,” were both far more critical of the MAGA caucus than of the Squad.Mann was adamant in his email:The MAGA Caucus is antidemocratic, authoritarian, and completely divorced from reality and truth. The Squad embraces left views well within the democratic spectrum. What’s striking about the MAGA Caucus is that they are closer to the Republican mainstream these days, given the reticence of Republican officeholders to challenge Trump. We worry about the future of American democracy because the entire Republican Party has gone AWOL. The crazy extremists have taken over one of our two major parties.The MAGA group, Ornstein wrote by email, is composed ofthe true believers, who think Trump won, that there is rampant voter fraud, the country needs a caudillo, we have to crack down on trans people, critical race theory is an evil sweeping the country and more. The Squad is certainly on the left end of the party, but they do not have authoritarian tendencies and views.Ocasio-Cortez, Ornstein wrote, “is smart, capable, and has handled her five minutes of questioning in committees like a master.”William Galston, a senior fellow at Brooking and a co-author with Elaine Kamarck, also of Brookings, of “The New Politics of Evasion: How Ignoring Swing Voters Could Reopen the Door for Donald Trump and Threaten American Democracy,” wrote by email:How does one measure “extreme”? By two metrics — detachment from reality and threats to the democratic process — the nod goes to the MAGA crowd over the Squad, whose extremism is only in the realm of policy. I could argue that the Squad’s policy stances — defund the police, abolish ICE, institute a Green New Deal — have done more damage to the Democratic Party than the MAGA crowd has to the Republicans. President Biden has been forced to back away from these policies, while Republicans sail along unscathed. By refusing to criticize — let alone break from — the ultra-MAGA representatives, Donald Trump has set the tone for his party. A majority of rank-and-file Democrats disagree with the Squad’s position. There’s no evidence that the Republican grassroots is troubled by the extremism in their own ranks.I asked Galston what the implications were of Marjorie Taylor Greene winning renomination on May 24 with 69.5 percent of the primary vote.He replied:Trumpists hold a strong majority within the Republican Party, and in many districts the battle is to be seen as the Trumpiest Republican candidate. This is especially true in deep-red districts where winning the nomination is tantamount to winning the general election. A similar dynamic is at work in deep-blue districts, where the most left-leaning candidate often has the advantage. Candidates like these rarely succeed in swing districts, where shifts among moderate and independent voters determine general election winners. In both parties, there has been a swing away from candidates who care about the governance process, and toward candidates whose skills are oratorical rather than legislative. I could hypothesize that in an era of hyperpolarization in which gridlock is the default option, the preference for talkers over doers may be oddly rational.They may be talkers rather than doers, but if, as currently expected, Republicans win control of the House on Nov. 8, 2022, the MAGA faction will be positioned to wield real power.Joshua Huder, a senior fellow at Georgetown University’s Government Affairs Institute, explained in an email that there has beenchange in lawmaking that amplifies the extremes of majority parties. In previous generations, extreme progressives or conservatives were more easily excluded from rooms where policy and procedural decisions were made. Either committee leaders would craft deals away from their party caucuses or leaders had an easier time finding moderates in the other party to craft solutions that the extreme wings of their caucus might oppose.In contrast, Huder wrote:Today’s partisan-cohort legislative style inherently incorporates more extreme voices. Decisions are made within the caucus or negotiated with various caucus factions through leadership offices. Put simply, the influence of extreme wings of each party are more intimately woven into legislative negotiations. And as a result, intense partisan warfare is more common.In this environment, Huder continued, “undeniably, their influence on congressional decision making has grown. They don’t get what they want all the time, but many congressional fights and tactics can be explained by the influence of the more extreme wings of each party.”Recent history suggests that the MAGA caucus and the overlapping but larger Freedom Caucus have Kevin McCarthy, the House Republican minority leader who is favored to become speaker of the House if his party takes control, firmly in their grip. The Freedom Caucus played a key role in forcing Speaker John Boehner out of office in 2015 and a central role in pushing Boehner’s successor, Paul Ryan, to retire three years later.“The Freedom Caucus has become the political home of right-wing troublemakers who often embarrass and even defy the party leadership,” Ed Kilgore wrote in the Intelligencer section of New York magazine. “A group of experienced ideological extortionists answering to gangster leadership of Trump is going to be hard to handle for the poor schmoes trying to keep the G.O.P. from falling into a moral and political abyss.”If McCarthy takes the speaker’s gavel next year, he will be in the unenviable position of constantly addressing the demands of a body of legislators who at any moment could turn on him and cut him off at the knees.The Times is committed to publishing a diversity of letters to the editor. We’d like to hear what you think about this or any of our articles. Here are some tips. And here’s our email: letters@nytimes.com.Follow The New York Times Opinion section on Facebook, Twitter (@NYTopinion) and Instagram. More