That smoke about affairs came from the Trumka union leaders lying during a campaign. It's expected for them to do that. even if untrue, I've seen it in several elections, when there is nothing else bad to say about the Republican.
Well, it started with the establishment Republicans who didn't like her because she's a female, minority AND Tea Partier. The Democrats just picked up the lies and ran with them in the general election.
The guy claiming the affair hasn't produced any evidence to back it up, and it's been almost three years. If there were any fire, we probably would have seen something by now.