A fellow who once interned with Newt Gingrich, Mitt Romney and Paul Ryan is facing federal charges for hacking into female college students' e-mail, copying their nude photos and then threatening to distribute them if they didn't send more. This is pretty sleazy behavior and if it's true, the guy oughta do hard time in a place where the view out his window is lessened by metal bars.
However, it's also a little sleazy to try and suggest something about his past employers, even if they didn't pay him. Newt, Mitt and Paul aren't responsible for this jerk even if there are photos of them posing with him. (Heck, there are photos of me posing with all sorts of people I either don't know at all or do and don't approve of.) However tempting it is to try and score points against a foe with something like this, it's possible — probable, even — that the "boss" didn't hire the man, didn't do a background check and certainly didn't know the kind of person he was. Every company in the world sometimes hires people they wish they hadn't.
Guilt-by-association is the kind of thing you charge against an opponent when you don't have any evidence that they themselves are guilty of anything. In the case of Romney, Ryan and especially Gingrich, there's plenty without resorting to this kind of thing.