It's a census year, and the local weasels elected in 2010 will be doing the redistricting in 2011.
That's just MY $0.02 worth. 'Tis where I'm working the hardest, along with getting rid of my current Dim (democrat, also dim) CongressCritter.
Yep, in the Red states it will be tough for anyone with a D to win a race at any level. This will happen in some purple states as well. Governors and legislatures are going to shift to the GOP. These are the people who will redistrict for next ten years. Also Texas will gain some seats and some blue states up north will lose seats. This should shift the margin back toward the GOP.