And if he stayed home, those who aren't going to vote for him anyway would say he lacks international experience. Yawn.
I think the angst he is stirring up is mostly among Democrats who see Obama upset the Jewish voters who normally vote Democrat. Combine that with Obama's attacks on achievement oriented people, who statistically are disproportionately Jewish, and there's real concern among the donkeys they might lose this November.
And before anyone gets his/her boxers in a bunch, I invite you to read Rabbi Daniel Lapin's book Thou Shalt Prosper, as he has researched Jewish prosperity extensively.