The Democrats are social democrats, similar to OTL European social democratic parties (albeit more populist), or like progressive Dems in the OTL United States. They also allied and merged with some state-level Socialist Parties, such as in WisconsinQuestion - what is the essence of the Republican Progressivists and Democrats contradictions, and how do they differ from the OTL counterparts?
The Republican-Progressives, contrary to their name, aren't very progressive by TTL's standards, instead they're similar to OTL European liberal-conservative parties, or like OTL John Kasich. They do have a slight civic nationalist bent though
The Republican-Progressives used to have a progressive "Roosevelt wing", but they mostly emigrated to the Democratic Party in the 60s and 70s
Since the 2016 election Adam Sharp has been much more populist than the majority of the Republican-Progressive Party, but he's not quite Trump. Before that he was just a normal Republican-Progressive though