It depends on how you measure it.
If it's by pure, unreasoning hatred, it would be close, with perhaps Palin edging Bush out by a few hate points.
If it's by, say, laying every ill in the world at the feet of one or the other, that would have to go to Bush, hands down. You know for eight years he was the root cause of every bit of suffering of humankind.
At this point I have to give the overall score to BDS, though since it is cumulative, PDS could overtake it in a couple of years.