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RINOs are getting tiresome. Unfortunately the districts have been so redrawn and redistricted, that even RINOs are hard to displace. It is possible. But it takes a great challenger and a lot of money.

I'm not sure if it's possible except in VERY rare cases.
Like Ted Cruz.
I've about given up.

If you read about monkeysphere, dunbar's number, behavioral sinks, rat utopia, and the Iron Law of Bureaucracy you'll understand why. I'm not being pessimistic...just facing facts.