Brendan Nyhan has a nice political science-y followup on the bipartisanship issue, complete with charts of partisan polarization in congress. The charts illustrate both that the bipartisanship era was a historical aberration and that it was very specifically driven by the presence of a large number of conservative southerners in congress who were members of a mostly non-conservative Democratic Party because they were also hard-core white supremacists and being Democrats was part of maintaining Jim Crow. The departure of these times and the rise of ideologically coherent parties isn't really something to be sad about.

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