Sen. Specter's Party Switch Upends Pennsylvania Politics Heading Into Election

I'm sure someone else will post this story as well, but this is a HUGE news story in terms of Washington politics and the Dem's possibly getting a Super Majority now and even more so the fact he has had an "R" by his name for 30 years and now all of a sudden he's switching.  My question is what happens 7 years from now if he wins this time and decides to run again and at that time the Dem's aren't doing well; will he switch sides again?!  This also takes into account ideas we've touched on in class dealing w/ candidate-centeredness; this move is clearly about him wanting to continue as a career politician because he knew he wouldn't have even made it out of the primary this election season, so by ruthlessly switching he increased his chances of being able to continue on in the Senate, sacrificing his principles I feel all just so he can win, because apparently that's more important to him.