Former Iowa Gov. Tom Vilsack, who's also a Clinton supporter, went after Rudy Giuliani in a television interview, reports the New York Daily News.

"I can't even get into the number of marriages, [and] the relationship he has with his children," Vilsack said.

Which raises an interesting question: Is there an opening for the GOP to hit the Democratic candidates on their family lives? Off top of my head, can't remember much about Edwards or Obama that seems obvious. And for the Clintons, because Hillary's the wife, there's a strong possibility that going after their family life would backfire.