It would be nice if the world were that simple, but Obama's prospects for a second term depend heavily on what alternatives are presented in 2012. Obama's broken promises, sure...but he hasn't done anything that would make a rational human give so much as a thought to voting for Sarah Palin or Dick Cheney. Barring the introduction of a hitherto unknown miracle candidate, the majority of the country will go into selective memory mode and vote the safe way.
Don't waste your vote, vote Green or Independent in the next election.
You don't think Liz Cheney is ugly? Give it time...you will.