I don't think that there is a practical national alternative to the Republican party for conservatives. Not now, and not in the foreseeable future. Since I consider myself a conservative first, I have, do, and will continue to vote Republican.
How do we influence change in the party when we think it's necessary? I can see why those who believe that "Vote 'em out!" is the most direct way to make their concerns known. It's a statement phrased in language every career politician understands. It's also cutting off one's nose to spite one's face if a rat gains office and proceeds to run wild for even a term or two.
What is the alternative? I wish I knew.
I've never and will never pull anything but the Republican lever. They aren't perfect, but they're the best chance we have in this country to turn away from socialism.