Yes, Stockman ran as the conservative alternative to Cornyn who he attacked as part of the problem due, at least in part, to the fact that the incumbent is the second ranking Republican in the Senate. And, yes, some of Stockman's views on the problems with the Republican party in Washington align with the tea party. But, the idea that Stockman was a tea party darling is simply not true. In fact, it's hard to find a single major tea party group that endorsed Stockman's campaign. Several leaders of the tea party even denounced it.
And, in other downballot races -- lieutenant governor and attorney general to name two -- candidates who ran as tea party aligned insurgents against more established Republicans did quite well, making predictions of the demise of the tea party in Texas very premature.
So, if Stockman's resounding defeat doesn't tell us anything about the tea party, what does it tell us? Simple. Candidates and the campaigns they run matter. Go back to the end of last year and the Texas filing deadline. There was significant excitement about the possibility of a genuine tea party candidate getting into the race. And, had a candidate with genuine skills committed to raising money and running a real campaign decided to run, there is at least the possibility that Cornyn might have been pushed to a runoff in late May.
Instead, Stockman ran. He raised no money and the only headlines he drew were for controversial comments he made along the way. By the end of the race, it was hard to tell whether Stockman was even campaigning. He was a forgettable candidate who ran a forgettable race. And that's why the comparisons between he and Texas Sen. Ted Cruz (R) were always ridiculous. Like him or hate him, Cruz is a charismatic candidate who effectively carries the tea party message as well as anyone in the country. Stockman isn't anywhere close to Cruz in terms of natural ability or a commitment to doing the sorts of thing (like, you know, raising money or appearing in public) that winning candidates do.
Steve Stockman, like many bad candidates before him and all of those who will follow in his ignominious footsteps, lost because he was a terrible candidate who ran a non-campaign. That's it.