Obama's in a no win situation. If he leaves the attacks unanswered things will only get worse. Pat Buchanan called him "exotic" last week. Try to fight back and you'll get accused of play the race card, labelling all your critics bigots. Laura Ingraham and pretty much everybody on FOX is doing that now.
In all fairness, Obama's life experience is "exotic" in the fact most Americans have grown up in different countries. Likewise, McCain's life experience in not what most Americans have seen.
My life experience is "exotic," compared to most of the people on board.