But put aside the question of how to maintain ideological balance in a diverse republic, and eliminating the filibuster is still not such a good idea for Democrats. In fact, it’s a really bad idea. So bad that Mitch McConnell might actually vote in favor of it if they bring it to the floor of the Senate.

Let me explain.

Two major changes have occurred in the world of partisan alignments since 1948: the Mountain West returned to the Republican fold after flirting with progressive Democrats, and the South converted to Republicanism.