Political analysts used to say that the Democratic Party was riding a demographic wave that would lead to an era of dominance. But that “coalition of the ascendant” never quite jelled. The party did benefit from a rise in nonwhite voters and college-educated professionals, but it has also shed voters without a college degree. All this has made the Democrats’ political math a lot more precarious. And it also poses a kind of spiritual problem for Democrats who see themselves as the party of the working class.

Ruy Teixeira is one of the loudest voices calling on the Democratic Party to focus on winning these voters back. He’s a senior fellow at the American Enterprise Institute and the politics editor of the newsletter The Liberal Patriot. His 2002 book, “The Emerging Democratic Majority,” written with John B. Judis, was seen as prophetic after Barack Obama won in 2008 with the coalition he’d predicted. But he also warned in that book that Democrats needed to stop hemorrhaging white working-class voters for this majority to hold. And now Teixeira and Judis have a new book, “Where Have All the Democrats Gone?: The Soul of the Party in the Age of Extremes.”

In this conversation, I talk to Teixeira about how he defines the working class; the economic, social and cultural forces that he thinks have driven these voters from the Democratic Party; whether Joe Biden’s industrial and pro-worker policies could win some of these voters back, or if economic policies could reverse this trend at all; and how to think through the trade-offs of pursuing bold progressive policies that could push working-class voters even further away.

Mentioned:

“‘Compensate the Losers?’ Economic Policy and Partisan Realignment in the U.S.”

Book Recommendations:

Political Cleavages and Social Inequalities, edited by Amory Gethin, Clara Martínez-Toledano, and Thomas Piketty

Visions of Inequality by Branko Milanovic

The House of Government by Yuri Slezkine

Thoughts? Guest suggestions? Email us at ezrakleinshow@nytimes.com.

You can find transcripts (posted midday) and more episodes of “The Ezra Klein Show” at nytimes.com/ezra-klein-podcast, and you can find Ezra on Twitter @ezraklein. Book recommendations from all our guests are listed at https://www.nytimes.com/article/ezra-klein-show-book-recs.

This episode of “The Ezra Klein Show” was produced by Annie Galvin. Fact-checking by Michelle Harris, with Kate Sinclair and Mary Marge Locker. Our senior engineer is Jeff Geld. Our senior editor is Claire Gordon. The show’s production team also includes Rollin Hu and Kristin Lin. Original music by Isaac Jones. Audience strategy by Kristina Samulewski and Shannon Busta. The executive producer of New York Times Opinion Audio is Annie-Rose Strasser. Special thanks to Sonia Herrero.