If the Dem plan passes to raise marginal tax rates to 47% passes (which it won't), the GOP will get near to taking control of the House in 2010, with about 10 seats gained due to party switches. There was an interesting piece in the WSJ today, that the Dems control a majority of the hyper wealthy CD districts, and most of those Dem congresspersons are sweating bullets.
There are no permanent alignments, just permanent interests.
A lot of those wealthy districts are also super liberal. They are represented by safer than safe Democrats like Carolyn Maloney, Pete Stark, and Henry Waxman.
The WSJ today said there is a rebellion among these Dems from wealthy districts, and some blue dogs, and a big tax increase on the rich is effectively dead. This does not surprise me at all. It was political poison, and I stand by my prediction, which of course, will not be tested.