Despite the fact that he is an Obama supporter infiltrating the event, The Des Moines Register took the bait, writing that he was, "a 45-year-old Baptist minister and technology business owner ..." However, the newspaper also noted he attended the meeting by passing himself off as a member of the press. The Huffington Post also advanced the notion that this guy is a "Baptist minister worried about McCain's temper."
By the way, I thought McCain handled it very well (so much for having a bad temper). If this was an attempt to demonstrate that McCain has a bad temper, it failed miserably. After all, if that sort of question doesn't make you irate, I'd say you're pretty unflappable.