Principle, and the U.S. Constitution take a back seat when it comes to just getting elected.
That's how we got stuck with Romney-the-RINO (although I will NEVER vote for another RINO, period).
Even Rush has recently said that he now realized that the Republican Party had NO ideology. The leaders of the GOP are hollow men, they talk the talk but do not walk the walk. However, now that people are catching on to the fact that not all that glitters is gold in the world of politics, hopefully there will be a spring cleaning in the Republican Party.