Short answer. Sadly, no
I agree....BUT!
There is a way to do it.
The way you do it is from the inside of both parties. The TEApartiers are well on their way right now.
Conservative "third parties" could also infiltrate the RATs, but they would either have to run in certain types of conservative RAT districts.....
or LIE like a rug, pretending to be a RAT, and then defect some time after they were seated in whatever body.