For one, I had nothing to do with Pelosi or the Dem majority in Congress, I was one of the so-called Obama-Terry voters in that Obama won the electoral vote from the NE-2nd but Terry kept his house seat. Terry's a do-nothing boob (seriously, he's had his seat for 14 years now and I can't think of anything he's done noteworthy other than appear on Colbert), but the Dem Candidate was a scuzzball I wouldn't wish on my worst enemy.
I also don't listen to Olberman or talk-radio, never bought into Obama's mantra of change. I still think he should have waited til 2012 or 2016, as a one-term senator probably isn't ready for the presidency (which appears to be bearing out). I still disagree with him on many things. All I did was fill in a circle at polling place.
But what else was there to do? Voting 3rd party essentially is the same thing as voting for Obama from an EV standpoint (ask the Nader and Perot voters about that), and even if I wanted to go 3rd party, the Libertarian party isn't the answer since their official positions are more extreme than even the Tea Party's.
I'm a socially moderate fiscal conservative. I'm not sure there's a party out there that wants my vote anymore.