I would be surprised to see Murtha do much local campaigning himself. Surrogates and campaign commercials with some tightly controlled townhall type events. Murtha's handlers will not risk a public appearance where there is the possibility he will get his chain yanked by some wayward Freeper.
If I were one of his handlers (God forbid) I wouldn't worry about FReepers. With Murtha's verbal vomit problem, I'd be afraid to let him off his leash.