So says the one term senator who became president.
And he started his Presidential campaigning after two months in his Senatorial office. I.e., he only 'served' as a U.S. Senator for two months before continuing the only craft that he's shown an aptitude: Community Agitator.
Obama is the embodiment of the rejection of Martin Luther King's Dream - Obama's career, and elections, were based on the color of his skin and not his character.