Carpet bagger

What's a carpet bagger? They call Hillary that all the time and also mention Filegate? and Travelgate?
What's a gate--a scandal?

"Gate" refers to the Watergate scandal that brought down President Richard Nixon. The Watergate is an apartment building in Washington. Some of the President's men bugged the office of a Dr. located in the Watergate building, which is a crime and the President knew about it meaning he was party to the crime.