Well, yeah, there's a lot of forgiveness in politics, too. Of course, both sides are going to forgive the peccadilloes of their own, and why wouldn't they?
But overall, I think the public seems to be more numb to allegations of marital infidelity in politics. While it pretty much killed Gary Hart's campaign for president back in the 80s, it didn't seem to have much effect on Clinton's campaign. Even JFK is still beloved by millions, despite his affairs.
More people overall seem accepting of it than in previous eras. Stories like that seem to have a certain titillating appeal to a voyeuristic public always on the lookout for a cheap thrill.