Anthony Wiener, Jim McGreevey, Robert Bentley is being impeached, Gary Hart, John Ensign, the list goes on.

What I would argue is that Petraeus and Giuliani aren't elected officials. They don't have to answer to voters. Giuliani's attempt to run for Senate ended with his affair and his run for President in 2008 was a complete bust.

As for Trump, I'd say he has the benefit of the claims against him are "old" and thus have a distance to them. But also he's been a public lech for so long, that it's kind of like how most people didn't get horrified over Bill Clinton's affairs.

That said, Amy Koch got a raw deal on that from her co-workers.