thats pretty naive to say that a republican is a still a republican. The only way that anyone is going to be elected to office is if they affiliate themselves with one of the two parties. Someone who decides to run as an independant has no chance compared to someone who runs as a republican/democrat even if he has better qualifications, better policies, etc. You have to choose one of the two sides to have a chance, even if most of your views don't match up with the norm for the party.
Yes, both sides suck, but thats just the way the whole bullshit system works