Colbert is entering the Republican Presidential primary in his home state of South Carolina. It was kinda sparked by a recent poll that showed him beating the pathetic actual candidate Jon Huntsman, who has since dropped out of the race.
Stephen was moaning about not being able to get on the ballot, by virtue of South Carolina "splitting hairs over little things like being two-and-a-half months late to file." He also mentioned that, due to the same deadline, former candidate Herman Cain couldn't get OFF the ballot.
So Stephen is asking South Carolinians, INCLUDING DEMOCRATS ETC. because any registered voter can vote in a primary in South Carolina, to vote for Herman Cain...which he'll take as a vote for Colbert.
It's brilliant. It's infuriatingly friggin' brilliant.