Oh, I certainly know, but the question is not quite so straight forward. The Tea Party endorsed candidates who are clearly "establishment" Reuplicans, and more importantly, establishment Republicans lost races where a Tea Party candidate would have not stood a chance. But, let's look at the record.
Jeff Flake won in Arizona. Tea Party or establishment? Only the shadow knows.
Richard Mourdock lost in Indiana. Not establishment
Charles Summers lost in Maine. Establishment guy, Tea Party supported
Scott Brown lost in Massachusetts. Care to guess how a conservative wing guy would do?
Todd Akin lost in Missouri. He was the McCaskill conservative candidate and we all know how that worked out.
Denny Rehberg lost in Montana. Establishment guy. Got anyone in mind who could have beaten Tester?
Heather Wilson lost in New Mexico. This RINO is way too conservative for NM
Josh Mandel lost in Ohio. Just a bad candidate period, not establishment
Tom Smith lost in Pennsylvania. Tea Party guy who is a former Democrat.
George Allen lost in Virginia. Establishment. Think someone else could have done better?
John Raese lost in West Virginia. Establishment guy. Manchin won by 60%, next question
Tommy Thompson lost in Wisconsin. establishment guy who couldn't beat Tammy Baldwin.
Akin was not the choice of the tea party or Palin, so no one owns him (except endorser Michelle Bachmann and the GOPe who campaigned against him in the election), the establishment came out against him after he won the primary in a 3 way split, who knows how much these republican establishment campaigns against republican nominees cost us.
Jeff Flake wasn’t tea party, but was a Palin guy won.
Mourdock was a tea party/Palin guy who the establishment supported and Romney endorsed and made ads for.
Scott Brown was establishment through and through he had tea party people like me helping his campaign, but he was so harshly anti-conservative that he was kicked out of the Senate when he became a man without a base.
Summers establishment, lost.
Heather Wilson establishment, lost in a state with a Palin, Grizzly-mama Governor.
Denny Rehberg establishment guy lost.
George Allen establishment lost, again.
Josh Mandel establishment, lost.
John Raiese, establishment guy, lost.
Tommy Thompson establishment guy, lost.
Palin gave us our only bright spots, our only Senate seat pick-up with Deb Fischer, and Ted Cruz of Texas, the disaster of Mitt Romney gave us Obama, cost us the Senate, and seems to have put the GOP on the verge of splintering as he undermined their platform, and branded them in the worst way possible.