That's from a poll conducted by Upworthy, which found (surprise, surprise) swing state voters evenly split.
On the same token, Clint Eastwood edged out Oprah Winfrey, "even after the whole chair thing."
As for the serious polling question, President Obama and Mitt Romney are tied at 47%.
Source:
http://www.wilshireandwashington.com/2012/11/democrats-for-stewart-republicans-for-colbert.html