One other thing about 2010. If the Democrats can hold onto their 2006 gains and possible 2008 gains in that election, then the Democrats will likely control the redistricting process in states like Michigan and Ohio, thus giving the Democrats a huge leg up for the 2010's.
Michigan's 2010 Gov race will likely be intensely competitive (and Republicans could find themselves back in control of the legislature by then), and Democrats made little headway into the Ohio State Senate, leaving the GOP a huge, nearly veto-proof margin there.
Redistricting in Ohio is done by a panel of executive branch officials, and that group now has a Democratic majority and may well keep it after the 2010 elections. In Michigan, even a split D/R process for redistricting would favor Democrats because Republicans have overstretched their numbers in the current map and should the state lose a district it will have to come out of their hide.
