Its a sad truth isn't it?
I have a friend who votes Republican, but she sometimes plays devils advocate with herself (I think it's subconcious).
So last election year I put the contrast to her in a way that just hit her right between the eyes. To be fair, she's not a political junkie, so she only has a rudimentary sense of whats going on. But she has a nephew in the military, so I told her she was lucky her nephew isn't from Pennsylvania, because Rendell wasn't going to extend the date for military votes to get back from overseas and be counted, even after they were sent out late.
She took the bait and said that was wrong. I said well, you could call his office, but you can't reach him today, because he's at a Pennsylvania prison to make sure all the prisoners that haven't been convicted yet get to vote.
That day I turned a wobbly Republican into an unshakeable Republican. :)