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It's MUCH WORSE. The tea party, and conservatives, and republicans agree almost completely on principles. Disagreements were on priorities, goals, and willingness to compromise principles to reach goals. When you have agreement on principles, you can negotiate.

Old dems (liberals) and new dems (progressives) disagree on principles. One of the most obvious principles they disagree is individual freedom
liberal: I disagree with what you say but will fight to death for your right to say it
progressive: I disagree with what you say so shut up. If you won't shut up, universities and media companies should shut you up. If they can't, the government needs to step in

Liberals and progressives have similar disagreements on freedom, rights, sovereignty & separation of powers (states rights, US vs UN rights, court vs legislation, etc) almost every principle.

From Wilson to Clinton, Ds followed classic liberal principles and incorporated progressive principles where they could - sometimes compromising liberal principles, but at least being aware that they were compromising principles they valued.

Obama ran on liberalism even though he and his administration ruled with progressive ideas. Then Bernie came along and got a lot of D voters to abandon liberalism (with much help from universities, media, etc). They have voters, members of congress, the media and many presidential candidates fighting against liberal principles. It's not a large percent of Ds, but they are very loud. And liberal Ds have A LOT MORE IN COMMON with Rs than with progressive Ds.

I don't see any D who can unite liberals and progressives - that's not possible on principle but could happen with a focus on goals. I can see Trump convincing a lot of liberal Ds how insane progressive Ds are and that progressives are the future of the party.