Get real, Hensarling is not tea party, one of the biggest complaints is his anti-tea party stance in New York, also his support by long time leader, and anti-tea party/anti-Palin man Cantor.
There is a reason that conservatives first reaction was to ask who he is.
So in other words, you have no proof that he is not “Tea Party” and are using an endorsement as your sole justification against the man.
The reason conservatives had to ask who he is is because he has not been a glory hound or media member in the past. In fact, in 2008 he was supported for this role and stepped aside to let Mike Pence take it. Pretty much the same thing Bachman is doing.