The White House and Democratic leaders are still scratching their heads over Alvin Greene, the unemployed veteran with a felony pornography charge who somehow won the party's nomination for the Senate in South Carolina without any funding or visible campaigning. Appearing on NBC's Meet the Press on Sunday, top White House adviser David Axelrod said that Greene's victory does not appear to be legitimate. "How he won the primary is a big mystery," he said. "Until you resolve that, I don't see how you can claim to be a strong candidate." Greene's stunning victory has even spurred rumors that his candidacy was a Republican "plant."