Condi Rice would be an exelent and wise choice for VP. She's experienced in domestic and international affairs. Also being an African-American woman she can draw votes from women and the black voters.
Obama's "race card" could also be used against him, "If you don't vote for Romney and Rice, R & R, you don't like black women and you're a racist. She would be a good republican candidate for president also in the 2020 election