500 Days Of Summer is about a loser who thinks he can make his girlfriend love him. He's a super nice guy and his girlfriend is a player. She likes him enough for now, but she lets him know he's not the one. He takes this as a starting point and wastes 500 days trying to change her mind.
This is Mitt Romney. Mitt feels that with enough money, attack ads and photo-ops, conservative America will come around. However, there is nothing he can do to make us love him. It's not that we don't know him; it's that we do know him and we don't like him. Mitt thinks he can become President by the force of his will, a half billion dollars and the PR department of the LDS church. Like Summer in the movie, the public will party with Mitt, sleep with Mitt and spent 500 days being courted by Mitt, but in the end they're going to marry someone else. It's like your Mom setting you up with the sweet neighbor girl. Who are you going to go out with? I bet you're going to bring home the Goth-Girl with the bolt in her head.
It's all about arrogance. Mitt is saying I'm so handsome, so moral, such a family man, a man of Gods, such an entrepreneur that I make 20 million a year in my bathrobe; how can you not love me? How can you love that chubby old man with three wives? How can you love that home-schooling youth pastor wannabee? How can you love that senile old codger who wants to close the Federal Reserve?
It's easy to understand, Mitt; the other guys aren't YOU!