Can Herman Cain win in 2012 because he's black?

If the GOP nominates Herman Cain, do you think he can possibly beat Barrack Obama because he's black? I mean, Obama got mostly all of the black vote last time, and I know blacks generally vote democratic, but given the option of 2 black candidates, do you think Herman Cain can get some of the black vote and win the election in 2012? Also whenever he criticizes Barack Obama, there will need to be some explanation of Obama's policies and not just a cop-out "oh the GOP is racist."