Over the past four decades, the percentage of white Democrats who identify themselves as liberal has more than doubled, growing at a much faster pace than Black or Hispanic Democrats.In 1984, according to American National Election Studies data, 29.8 percent of white Democrats identified as liberal; by 2020, that percentage grew to 68.5 percent. Over the same period, the percentage of liberals among Black Democrats grew from 19.1 percent to 27.8 percent, and among Hispanic Democrats from 18 percent to 41 percent.This shift raises once again a question that people have been asking since the advent of Reagan Democrats in the 1980s: What does it mean for a party that was once the home of the white working class to become a coalition of relatively comfortable white liberals and less well off minority constituencies?I posed this and other questions to a range of scholars and political strategists, including William Galston, a senior fellow at Brookings, who recently cited similar (though not identical) trends in Gallup data. In an essay last month, “The Polarization Paradox: Elected Officials and Voters Have Shifted in Opposite Directions,” Galston wrote:In 1994, White, Black and Hispanic Democrats were equally likely to think of themselves as liberal. But during the next three decades, the share of White Democrats who identify as liberal rose by 37 points, from 26 percent to 63 percent, while Black and Hispanic Democrats rose by less than half as much, to 39 percent and 41 percent, respectively.Galston argued in an email that Black Democrats have assumed an unanticipated role in the party:African Americans are now a moderating force within the party. It was no accident that they rallied around the most moderate candidate with a serious chance of winning the nomination in 2020, or that the leader of the pro-Biden forces took the lead in rejecting the “defund the police” slogan.The coalition of upper-middle-class liberals and minority voters, Galston wrote, “has been sustainable because the former believe in the active use of government to fight disadvantage of various kinds and are willing, within limits, to vote against their economic self-interest.”Julie Wronski, a political scientist at the University of Mississippi, wrote back by email:Underlying the liberal shift among white Democrats is their tendency to hold more liberal racial attitudes. In the Voter Study Group’s Racing Apart report, the percentage of white Democrats that hold the most liberal positions on the standard racial resentment measure has increased over the last decade to such a large extent that their racial resentment views match those of Black Democrats.The Democratic Party, Wronski continued, has becomea coalition of racial minorities (especially Blacks), and whites who are sympathetic to the inequities and challenges faced by minority groups in America. Racial identities and attitudes are the common thread that link wealthier, more educated whites with poorer minority constituencies.The Democrats’ biracial working-class coalition during the mid-20th century, in Wronski’s view, “was successful because racial issues were off the table.” Once those issues moved front and center, the coalition split: “Simply put, the parties are divided in terms of which portion of the working class they support — the white working class or the poorer minority communities.” The level of educational attainment is the line of demarcation between the two groups of white voters.By 2020, the white working class — defined by the Federal Reserve of St. Louis as “whites without four-year college degrees” — voted for Donald Trump over Joe Biden 67-32, according to network exit polls. In the 2022 election, white working-class voters backed Republican House candidates by almost the identical margin, 66-32.The shift of non-college white working class support to the Republican candidates, Wronski wrote,was driven by racial group animus. Trump was particularly able to attract members of the white working class on the basis of racial (and other) group sentiments — with those disliking minority groups being uniquely attracted to Trump, in a continuation of the division of the working class along racial lines.There are those who argue, however, that the contemporary Democratic coalition is more fragile than Wronski suggests. Ryan Enos, a political scientist at Harvard, emailed to say, “If you’re a Democrat, you might worry that the coalition is not stable.”Over the long haul, Enos wrote:College-educated whites, especially those with higher incomes, are not clear coalitional partners for anyone — they don’t favor economic policies, such as increasing housing supply or even higher taxes on the rich, that are beneficial to the working class, of any race. And many college-educated whites are motivated by social issues that are also not largely supported by the working class, of any race. It’s not clear that, with their current ideological positions, socially liberal and economically centrist or rightist college-educated whites are natural coalition partners with anybody but themselves.Enos went so far as to challenge the depth of elite support for a liberal agenda:My sense is that much of the college-educated liberal political rhetoric is focused on social signaling to satisfy their own psychological needs and improve their social standing with other college educated liberals, rather than policies that would actually reduce racial gaps in economic well-being, civil rights protections, and other quality of life issues.Paul Begala, a Democratic strategist, is an explicit critic of the left wing of the party. “It is plain to me that the Democrats’ greatest challenge is the progressive left,” Begala wrote in an email:Pew Research shows they are the most liberal, most educated, and most white subgroup in the Democratic coalition. They constitute 12 percent of Democrats and those who lean Democrat — which means 88 percent of us are not on their ideological team.In contrast, Begala continued:Black voters are both the most loyal Democrats and the most sensible, practical, strategic, and moderate voters. This is why it was important, politically and even morally, for President Biden to move the African-American-rich South Carolina primary ahead of overwhelmingly white Iowa and New Hampshire.In the November 2021 study of the composition of the Democratic Party that Begala referred to, Pew Research reported:The Progressive Left makes up a relatively small share of the party, 12 percent of Democrats and Democratic-leaning independents. However, this group is the most politically engaged segment of the coalition, extremely liberal in every policy domain and, notably, 68 percent White non-Hispanic. In contrast, the three other Democratic-oriented groups are no more than about half White non-Hispanic.This disproportionally white wing of the party, as I have previously discussed, provided crucial support for Alexandria Ocasio-Cortez and Ayanna Pressley when they ran for Congress in 2018, putting them over the top in their first primary victories over powerful Democratic incumbents.A variety of forces is straining the center-left coalition.Bruce Cain, a political scientist at Stanford, replied by email to my inquiries:Many White liberals live in enclaves of affluence, sheltered from the economic and personal insecurity of the low-income communities. They are more strongly motivated by identity issues around gender and race, but are less concerned with poverty or economic insecurity issues than liberals in the sixties.As a result, in Cain’s view:Parts of the Democratic coalition are talking past each other and sometimes clashing. In the case of climate change, white liberals want to accelerate the adoption of electric vehicles that most low-income nonwhites cannot afford. During Covid, affluent white liberals could work at home and have food delivered to them by nonwhite workers who left the food packages at their doorstep or who had to go to work and suffer higher rates of illness.When all said and done, “White liberals are still a better deal for nonwhites than the Republican Party,” Cain contended, “but it is revealing that the African Americans in South Carolina preferred Biden to Sanders or Warren.”The liberalism of white Democrats cuts across a wide range of issues. Brian Schaffner, a political scientist at Tufts, cited data collected by the Cooperative Election Study:In 2020 white Democrats scored similarly low on racial resentment as Black Democrats. And white Democrats actually have significantly lower levels of sexism than Black or Hispanic Democrats. In the 1980s and 1990s, the Democratic Party was indeed fairly divided on issues of race in particular, but that no longer seems to be the case.Now, Schaffner continued, “white Democrats appear to be the most liberal group in the party on a range of issues, including immigration, climate, crime/policing, abortion, health care, gun control and economic/social welfare.”I asked James Stimson, a political scientist at the University of North Carolina-Chapel Hill, how the meaning of “liberal” changed over the past 40 years. He replied:The term has become infused with racial content. That may be the key to the conversion of educated suburban voters into liberals and Democrats. Trump’s open racism must surely have added greatly to the new meaning of liberalism. Perhaps the L-word has become a way to say, “I am not a bigot.”Along similar lines, Viviana Rivera-Burgos, a political scientist at Baruch College of the City University of New York, pointed out how much the liberal agenda has transformed in a relatively short time:Issues like abortion, same-sex marriage and LGBTQ+ rights, and immigration have become important ideological cleavages in the past 40 years or so. Being a liberal today means you’re most likely pro-choice, pro-same-sex marriage, pro-expansion of LGBTQ+ rights, and anti-restrictive or punitive immigration laws. These issue positions couldn’t be inferred based on someone’s ideology alone 40 years ago.Lanae Erickson, a senior vice president at Third Way, a centrist Democratic group, argued in an email that there is a danger of overemphasizing the liberal tilt of the Democratic electorate:Although the percentage of Democrats calling themselves liberal has grown over the past three decades, it still remains true that only about half of self-described party members identify that way — in contrast to Republican voters, about 80 percent of whom call themselves conservative. So Democrats have long had and continue to have a more ideologically diverse coalition to assemble, with nearly half of the party calling themselves moderate or conservative.Erickson did not hesitate, however, to describe the party’s educated left wing asoverrepresented in the media, on Twitter, and in positions of power. That group is loud and more culturally liberal, though they often purport to speak or act on behalf of communities of color. Meanwhile, the African American and Latino voters who deliver victories to Democratic candidates in nearly every race have remained much more ideologically mixed.“If we continue to let white liberals on Twitter define what it means to be a Democrat,” Erickson warned her fellow Democrats, “we are going to continue to alienate the voters of color who are essential majority makers in our coalition. While the Twitterati wants to ‘Defund the Police,’ communities of color want their neighborhoods to be safe — both from police violence AND violent crime.”To build her case, Erickson cited that role of minority voters in the last New York City mayoral election: “They elected Eric Adams and rejected the far-left candidates whose voting blocs were made up primarily of white liberals,” noting that “Adams outpaced Maya Wiley by 23 points with Black voters and 10 points with Hispanic voters.”In local elections in 2021, Erickson continued, Black voters “rejected a measure in Minneapolis, where George Floyd was killed, to defund the police: According to ward-level data, the predominantly Black Wards 4 and 5 rejected the Minneapolis ballot measure by wide margins (over 60 percent voted no), while predominantly white wards drove the measure’s support.Erickson suggested that the culturally liberal tilt of the party’s left wing was a factor in declining minority support:Case in point: Democrats dropped nine percentage points with non-college voters of color between 2012 and 2020, falling from 84 percent support in 2012 to 75 percent in 2020, according to Catalist. This was most pronounced with non-college men of color who went from 81 percent Democratic in 2012 to 69 percent in 2020.These losses reflect “a divergence in priorities and values,” Erickson wrote, citing poll data showing thatwhile Democratic primary voters say hard work is no guarantee of success, Black voters disagree — saying most people can get ahead in America if they work hard, and that by a two-to-one margin, Black Americans say it is necessary to believe in God to have good morals. Democratic primary voters of all races disagree with that statement by similar margins.While the party is divided on values and priorities, Erickson pointed out that Democrats in Congress have reached general agreement on many issues that were highly divisive in the past:There is only one pro-life Democrat left in Congress, and today’s moderate Democrats are loudly supportive of reproductive rights. There are no more NRA-endorsed Democrats on the Hill, and if gun safety legislation were brought up tomorrow, every single Democrat in federal office would support it. Similarly, every Democrat not only supported the Respect for Marriage Act but would’ve likely gone further to explicitly codify marriage equality into law at the federal level.The major intraparty conflicts that remain, Erickson wrote,are concentrated around two big questions. One is a process question: Do you believe progress is achieved by incremental steps or revolutionary change? The other is a values question: do you believe that, with some basic policy reforms, our economic system can deliver a good life to those who work hard in this country, or rather that it needs to be torn down and fundamentally rebuilt from the ground up?The transition from a partisan division among white voters based on economic class to one based on level of educational attainment has had substantial consequences for the legislative priorities of the Democratic Party.Frances Lee, a political scientist at Princeton, pointed out in an email that “the class base of the parties has atrophied” with the result that “the party system in the U.S. simply does not represent that ‘haves’ against the ‘have-nots.’ Both parties represent a mix of haves and have-nots in economic terms.”Because the Democratic Party must hold down “a coalition of upper-income whites and minority constituencies across all income groups,” Lee wrote, party leadersare likely to prioritize issues that do not pit the well-off against the poor very directly, such as the rights agenda (e.g., voting rights, abortion, gays and lesbians) and climate/environment. Democrats in government are unlikely to genuinely prioritize the economic interests of low-income and working-class voters, because those voters simply do not represent a majority of their party’s coalition.As an example, Lee wrote, “Current Democrats are much more concerned about forgiving student loans than about the majority of voters who will not or did not go to college.”What, then, is likely to happen in the Democratic ranks?The reality, as summed up by Ryan Enos, is that for all their problems,The Democrats are clearly the majority party and may be a experiencing an unparalleled period of dominance: since 1992, a period of 30 years, Republicans have only won a majority of popular presidential votes once — in 2004 and that was during the extraordinary time of two overseas wars.For the moment, the Democratic coalition — with all its built-in conflicts between a relatively affluent, well-educated, largely white wing, on the one hand, and an economically precarious, heavily minority, but to some degree ascendant electorate on the other — remains a functional political institution.“In this sense,” Enos told me, “it’s important not to overstate the damage that some perceive liberalism as having done to the Democrats’ electoral fortunes.”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