Townhall.Com - Just as moderates are completely unrepresented in a Democratic Party that's dominated by liberals, movement conservatives often don't feel represented by the Republican Party.
At first glance, this seems rather odd since most Republicans in Congress are conservative. However, it's a natural reaction to the Republican establishment that has its hands welded to many of the GOP's levers of power. The Republican Party may be mostly conservative, but there are a multitude of reasons that you can't trust the establishment Republicans as far as you can throw them.
2) They always prefer moderates to conservatives. It should tell you something when the GOP establishment always, always, ALWAYS prefers the least conservative candidate. It backed Arlen Specter over Pat Toomey, David Dewhurst over Ted Cruz, Bob Bennett over Mike Lee, Trey Grayson over Rand Paul and Charlie Crist over Marco Rubio. Our two top "leaders" in the Senate, Mitch McConnell and John Cornyn, both endorsed Charlie Crist over Marco Rubio, a guy who is now being touted as one of the frontrunners for the presidency in 2016. When the best and brightest of the GOP in the Senate were almost universally opposed by the GOP establishment, what message does it send to the base? It sure as hell ain't "You can trust us" or "We're on your side." The real message is, "We're so frightened by our own base that we'd rather back future Democrats like Charlie Crist and Arlen Specter than movement conservatives."