Real estate mogul Donald Trump will not be a candidate for president in 2012.

The New York businessman bounded onto the scene with explosive rhetoric, catering to the fringe "birther" movement, raising questions aboutPresident Obama's place of birth, as well as the president's record as a student. (For the record, Obama was born in Hawaii and graduated magna cum laude from Harvard and served as editor of the Harvard Law Review.)

When the president released his long-form birth certificate, Trump took a measure of credit.