Yes. Bush's grandfather's business had close dealings with the Nazi's. Clinton's real father was a total jerk, and Obama comes from a dysfunctional family history if ever there was one.
I don't care about any of that. Of the three of them, Clinton was probably the best president and I think history will see him that way. Even at that, he favored NAFTA, he didn't do the unions any good at all, and he was a big money, big government president. Bush was a god-awful president, in his own right, absent any talk about his ancestors. What he did, he did himself. His father had the same ancestors but wasn't nearly as bad a president as the son. Obama has been a huge disappointment to us progressives, but I can't for the life of me figure out why you conservatives hate him. He is not responsible for his father's deeds any more than his daughters will be responsible for their fathers. He's sure not responsible for anything his pastor or his pastor's daughter does.
If God really meant that the "Sins of the father's will be visited on their sons," he wasn't any kind of God I want to worship. Newborn babies are too cute to get a dirty slate when they come into this world. We really shouldn't hold people's parentage against them in this day and age, not even on this crazy ass forum.