The chart above is from the invaluable people at Voteview, who use data on Congressional voting to measure political positions and polarizations. What it shows is what should be obvious, but much of the Beltway chattering class still refuses to acknowledge: there has been a huge increase in polarization, and it’s because Republicans have moved right, not because Democrats have moved left. (You want to look at the Northern Democrat line; the southern Democrats disappeared or became Republicans).

As I said, this is obvious; yet people who try to say this get frozen out of the discourse, even when — like Mann and Ornstein — they have heretofore been pundits in good standing. Instead, you’re supposed to wring your hands over partisanship in the abstract.

And when the attempt to turn this hand-wringing into actual political effort flops, you blame it on the false equivalency police!

The facts have a well-known anti-centrist bias.