From Allahpundit, a conservative, on the phenomenon of people thinking Obama is a Muslim:
It’s all very lame and obnoxious, especially given the testimony from pastors that Obama takes his Christian faith seriously, but much like the Birther thing, there’s virtually nothing you can say to convince someone who’s sure that O is what he thinks he is. I recommend re-reading Karl’s post from earlier this month on the phenomenon of polling Birthers, as it holds plenty of applicable wisdom in this case too. Essentially, when polling people who dislike candidate X, the specifics of the questions are almost irrelevant. As long as they’re negatively inclined — e.g., “Is Obama a werewolf?” — you’ll get a certain core percentage willing to say yes.