I didn’t know Obama had lost either, neverdem. Is there something about the uninformed American people that you know that I don’t?
Maybe. Check out the generic Exit Poll for House Race (2010) at CBS. (It's still downloading, so I'm linking it indirectly.) The sample was huge. The GOP finally got sixty percent of the white vote in 2010 for the first time in history.
Add in the remainder of the Jacksonian Democrats alienated by Obama's energy and environmental policies and folks alienated by Obama's attack on the First Amendment with the latest Obamacare mandate for free contraception and chemical abortions. I could be wrong, but I don't see how Obama keep his 2008 coalition together in the fourth year of the Great Recession.