They held their seats because 95% of all districts are non-competitive; just like for the Dems. Once elected you have a 95+% chance of being reelected.<quoted text>
If you think the Republicans are so extreme, then please explain why they retained their majoriy in the House of Repreentatives, and maintained their majority in gubernatorial seats. They also hold a majority of state legislative seats. You make it sound like they are a tiny minority with no power at all.
About the only thing they didn't win was POTUS\VEEP and a majority in the U.S. Senate. WOW. Two things out of the 1000+ contests in the U.S. this past election cycle.
Even in the giant "wave" elections like 2010, less the 15% lost reelection.
Btw, the GOP did lose seats in both the House and Senate.