I see H. Ross Perot (he was famous before he ran for President!) has brought up John McCain's treatment of his first wife. To recap, by the time he returned from Vietnam, McCain's first wife had been in a serious car accident. McCain, being an understanding guy, proceeded to chase women and ended up courting his current wife Cindy while still married (this has been conveniently glossed over in the current rev of McCain's wikipedia page, which only suggests that McCain 'met and began a relationship' with Cindy a few months before divorcing Carol Shepp McCain and elides the extramarital affairs that McCain himself has acknowledged, but you can find an old version here). Hensley family wealth and personal connections, of course, helped McCain win his first run for Congress in 1982.
I'm really curious what the more explicitly family-values-oriented conservatives like Ross Douthat think of this particular story. If you think a candidate's behavior in his or her personal life bears relevance to his merits as a Presidential candidate, McCain's dalliances with other women and near gold-digging appear fundamentally disqualifying, roughly on par with anything Rudy Giuliani did to his spouses.