Fidelity is a high priority in my own life and marriage. But that doesn't mean I judge others (esp. those I don't even know) by that standard. And leaders so often seem to fall victim to those sins...Like it or not, many of our previous Presidents don't have a very good record in terms of marital fidelity.
I understand that, and I wouldn't judge most people if they had one divorce. But, for example, it is worth noting that Romney has zero divorces while Giuliani has two (or is it three?). And, the circumstnaces surrounding Giuliani's are not that flattering.