by Mike Krumboltz It's not every day that the leader of the free world goes head-to-head with a singer known for wearing studded bras. But such a contest is brewing this weekend...on Facebook . The popular social networking site announced that President Obama and musician Lady Gaga are neck and neck in terms of their fan numbers; both are approaching the 10 million mark. As of press time, Pres. Obama has 9,109,788 fans, slightly behind Ms. Gaga, who has 9,138,206 supporters.