COLUMBIA, S.C. (AP) -- South Carolina's governor appears to have closed the door on appointing Stephen Colbert to the U.S. Senate, all because the comedian didn't know the state drink was milk.During \The Colbert Report\ on Thursday, Colbert urged his fans to send Gov. Nikki Haley messages on Twitter with the hashtag \SenatorColbert\ telling her why he would make a great senator from his home state. Haley is appointing a senator after Jim DeMint announced he is resigning at the end of the year.Colbert, who plays a mock conservative pundit on his show, also gave Haley four reasons he was the perfect choice.\You want somebody young