I cannot understand this way of thinking. If you will lie and cheat, then you lie and cheat. Period.
People act like we are two separate and distinct people and one is not related to the other. The very same person who lied to his wife and family and acted like a creepy weirdo is the same person who has been entrusted with the well being of people in his district. Same person. If he was a child molester but he didn't do it at work would it be ok for him to stay in office because he didn't do it while he was at work?
People don't like to face the fact that we are who we are. If you are a dishonest creep you just are. It doesn't stop when you walk into work.
And by the way, what would have happened if the person who uncovered the story volunteered to forget about it if the Congressman had agreed to vote a certain way on a bill or divert funds or divulge classified info that could then be sold to an enemy? That is even more reason why a politician's character matters.