Man up and accuse your dad of being a racist. Then tell him you will lose all respect for him if he doesn't vote Obama.
I've accused him of being a racist for the last 5 years or so, since he talks about colored folks, nigras, and when he's drunker than usual, n-words.
He then pulls out the kindly racism card by talking about how used to play with the black chilluns when he was a little boy in Athens, GA, and how he loved his colored mammy so much and how he knows he'll see them in Heaven with Jesus, just bless those colored folks' pure and simple hearts. He thinks that the Negroes betrayed him for his support of the civil rights movement by going and becoming rappers and criminals, and that back in the old days they were much nicer, save for the usual Saturday evening "cuttings" on street corners.
And he was never a Hillary fan since he's also moderately misogynistic.