In early 2020, Alexandria Ocasio-Cortez told New York Magazine that, “In any other country [she and President Joe Biden] would not be in the same party.” Yet, by April of that year, after Bernie Sanders dropped out, she “absolutely” threw her support behind Biden, saying “the stakes are too high when it comes to another four years of [former President Donald] Trump.” Since Trump’s victory in 2016, opposition to the former president has served as one of the strongest organizing principles for the Democratic Party. And that dynamic has likely helped paper over some of the “progressive left vs. establishment” divides that were visible in the 2016 and 2020 primaries. While the 2024 Democratic primary is essentially uncompetitive, some cracks in that unity have still emerged. For example, since Biden took office, one of his steepest declines in support has been among young voters, a cohort that backed Sanders in 2016 and 2020. Differing views of the current war between Israel and Hamas have further highlighted the generational divide in the party. In this installment of the 538 Politics podcast, Galen speaks with author Joshua Green about those divides, where they come from and how they may manifest in 2024. Green’s new book is titled, “The Rebels: Elizabeth Warren, Bernie Sanders, Alexandria Ocasio-Cortez, and the Struggle for a New American Politics.”