Mitt Romney has pulled all paid ads in Florida and South Carolina, where he has spent $5.5M combined. Instead, Romney is going to concentrate his efforts on winning his birth state of Michigan. It is hard to see this as anything but conceding these in hopes of winning in Michigan this Tuesday and using that to vault ahead. Perhaps we will live-blog his withdrawal from the race on Tuesday. If so, watch for Dave Burris to jump on the McCain bandwagon faster than you can say “Anyone but Huckabee.”