Over the 200 plus year history of political parties in the US, something our founders advised against, the same parties have, at different times, stood for different sets of ideas. The Federalists, the Whigs, the national Republican Party, the Democrats and others all have been made up of different coalitions at different times
We all know for example that Lincoln and his Republicans were once the anti-slavery party. Oh how that’s changed.
The modern Democratic party really emerged with the New Deal coalition beginning with FDR in 1933. It was an amalgam that was considered the core of American liberalism. It was anchored in ethno-religious constituencies (Catholics, Jews, African Americans,) white Southerners, well-organized labor unions, urban machines, progressive intellectuals, and populist farm groups.
However, like all previous party coalitions, it would begin to splinter. Elements of the once liberal base of the new deal coalition would become part of the Republican party of Nixon and Reagan and Trump.
The story of how this happened is really the story of our modern politics that begins in 1970 and it’s the story that David Paul Kuhn tells in The Hardhat Riot: Nixon, New York City, and the Dawn of the White Working-Class Revolution.
My conversation with David Paul Kuhn: