I wouldn't say it's small or insignificant. That minority is also quite vocal. I've spoken to enough people who actually believe some of the lies that I can't consider it "small".

As for what he's done besides get Bin Laden? How about when he took office, the Dow was scraping 7,000 and it's double that now. That means that everyone's retirement account has followed suit. Housing is in recovery. His auto industry bailout worked, and Cash for Clunkers succeeded beyond anyone's expectations. Unemployment is down as well.