It has become so standard for presidential candidates to visit all kinds of TV shows to grab the attention of all kinds of voters that as President Obama heads to an MTV forum on Friday, it's more notable who's not going along: Mitt Romney. On Wednesday, Obama visited with Jay Leno on his late-night chat show; last week he sat down with Jon Stewart on The Daily Show. That's not to mention his appearances last month on David Letterman and The View, or his April slow-jamming the news with late-night host Jimmy Fallon. Romney's last entertainment show appearance was on Live with Kelly and Michael in September, accompanied by Ann Romney, where he seemed at ease chatting about TV shows and other topics.