Sage advice from Alec Baldwin about the Mark Sanford affair: Don't Take the Bait.
Now is a wonderful opportunity to show the country what Democrats/liberals/progressives/unaligned learned from the Clinton era. Whatever personal problems that public officials deal with privately, leave them alone. This could happen to anyone, in any state, regardless of party. Why make the voters of South Carolina suffer while Sanford is skewered? If he wants to resign, so be it. If not, let him deal with it in private.
And Baldwin didn't say this but I will: lefty political sites like HuffPo and TPM have and are devoting a lot of time and attention to these Republican sex scandals. Hey, they're good for pageviews, right? That's part of the problem too. Aren't there more important political things going on in the world than this gossip?