For Rasmussen: http://www.rasmussenreports.com/public_content/politics/mood_of_america/generic_congressional_ballot
For Gallup, see: http://www.gallup.com/poll/127439/Election-2010-Key-Indicators.aspx
Rasmussen's numbers are actually more explainable, seeing as though some recent polls show more people supporting the health care law, and a slight bump for Obama's approval ratings.
But what's up with Gallup and their voter turnout scenarios? Why are they showing some kind of blowout (not looking at their RV polls)?