How did Murphy, as a first-term incumbent, win by *20 points* in this Romney +4 seat in 2014?
Seems like his opponent was probably weak but that's hardly enough to explain it?
Murphy was a good candidate — strong campaigner with a background in environmental consulting, in a district where environmental issues matter a lot. He also didn't have a primary opponent and was able to run sunny ads basically since he got elected. His opponent, meanwhile, endured a bloody primary where he emerged with <40%, and because of the schedule immediately had to turn around w/ very little time to try to make a dent in Murphy. National groups never seriously targeted the race; NRCC never played and I don't think any other major R PACs did either.