I think the president played the birth certificate situation very well. The majority of the voters saw these people as batsh*t crazies who weren't worthy of holding political office. By playing coy with the certificate and then suddenly releasing it without comment, he took the wind out of their sails. The right wingers who staked their reputations on it were suddenly w/o a cause and looked idiotic. Even better, some refused to give it up and doubled down on their bets causing them to look even sillier to the majority of the voters. Who cares about the voters who chose to believe the Birth Certificate craziness, they weren't going to vote for him anyway? Political brilliance!!