Via Lawrence Lewis, there's the gerrymandering situation:
Republicans are within reach of gaining control of eight or more chambers in statehouses around the country this fall, according to interviews with Republicans, Democrats and independent political analysts. That would give Republicans the power to draw more Congressional districts in their favor, since the expected gains come just as many legislatures will play a major role in the once-a-decade process of redrawing the boundaries of those districts.
Redistricting, it has often been said, turns the traditional definition of democracy on its head: rather than allowing voters to choose their leaders, it allows leaders to choose their voters.
My district, PA-6, for example, mostly follows the exact contours of where most of the eastern Pennsylvania rich people live. Deliberately carved out by Republicans to maintain the seat. If the Republicans get their hands on the redistricting maps, we can count on fewer Democrats and, subsequently, far fewer progressive Democrats. So feel free to stay home and brood about how Rahm Ate Your Baby. I'm sure that will somehow push the Overton window to the left. Somehow. No it won't.