Don't get too excited about those congressional poll numbers
Brad is right; Democrats shouldn't take much solace from the fact that opinion polls show 49% want the Dems to control congress, as opposed to only 36% who want the GOP in charge. I suppose it's better than 49-36 the other way, but it doesn't mean much. There's no national vote on which party gets to control congress, and a lot of people may prefer the Democrats in charge but will still go out and vote for the Republican congressmen just because they've been voting for him for the past fifteen years. You're talking about a series of local races, and the way they all add up doesn't always comport with the electorate's desires.