I wouldn't be so judgemental if I was you. Haven't you ever done anything you weren't proud of? This was a personal matter and none of us know the whole story not to mention, it's none of our business.
This is a time for condolences and sympathies. I'm sure Edwards is fully aware of what a schmuck he was and I kinda got a hunch that all the beating up by pundits is nothing compared to how he's probably beating up on himself. What Edwards did to his wife was shameful, be that as it may, he is a human being and my heart felt sympathies go out to him and his entire family for their loss.
For example, as a politician I do not hold George W. Bush in high esteem. He did things to his wife with his alcoholism when he was younger that were down right shameful, but if something, god forbid, were to happen to his lovely wife, my heart would go out to him.
Let he who is with out sin cast the first stone.