The key difficulty in drawing up target lists of potentially vulnerable House Republicans is, of course, redistricting. It's simply hard for us to know what most districts will look like come 2012. But some seats simply can't or won't change too much, whether by virtue of geography, politics, law or custom. I'm thinking, for instance, that the 2012 edition of Charlie Bass's NH-02 is unlikely to look very different from the 2010 version - and that Bass will be his usual weaksauce self, all but inviting a top-tier challenge. And Bass's next-door neighbor, the corrupt Frank Guinta, will probably wind up in the same boat.
These can't be the only two guys to make our early lists, though. Who else do you think will have a pretty stable district, and ought to face some trouble?