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It isn’t easy keeping either of America’s big coalitions together. In the opening months of the Trump administration, Republicans divided over foreign policy (neoconservative hegemonists vs. Jacksonian isolationists), trade policy (traditional Republican business interests and libertarians vs. Trumpian protectionists), immigration (ditto), health care (everybody against the Ryan plan) and, it now seems, even taxes. The Democratic Party was better able to unify around opposing Trump and the Republican desire to repeal Obamacare, but the division between its social-democratic and neoliberal wings – exposed by the surprisingly effective primary challenge of Bernie Sanders – reemerged in the struggle for Democratic National Committee chair between Keith Ellison and Tom Perez. The Trump era looks set to realign the partisan and ideological system that has characterized American politics for the last half-century.

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