Now,how do you know that...can you tell me, what your party(Dem's)stands for, next to(Rep's)?!
It looks to me that those elected representatives chose the party which represented, pretty much their beliefs(lower taxes,strong defence,hopefully tort reform and a miriad of assorted domestic things.
Maybe they just figured out that their constituents voted for the aforementioned, and decided that the "R" party is the right turn to deliver the promised goods.
Trust me they will be judged by their constituents when the time comes, and they know that very well. Hence the gambit...