Republicans certainly don't have as much room for growth.
I'm guessing Arkansas has term-limits, so that'd be a nice pickup. I think the GOP may pick up another seat or two, probably in the Northeast.
Gubernatorial races are very hard to predict this far out, as the economy is a huge factor, as well as who the President is. Republicans could gain 4 or 5 more seats, or Democrats would win 12 or so.
If Republicans gained four or five more seats, the Democrats would be down to a record low 11 or 12 seats out of 50.
