Please elaborate.
Cruz ran against the establishment candidate and longtime Texas Lieutenant Gov. David Dewhurst. Dewhurst was supported by such establishment forces as the Bush family, and other GOP stalwarts. He ran a grass roots, tea party campaign, and won, based on messages and now kept promises.
Dewhurst did his best, laid out gobs of his and other GOP-E money ($$$$$$ makes $$$$$$, after all) and initially led the polls by a humongous margin. Ted Cruz had little name recognition and less money but built an impressive ground game and dispatched Dewhurst handily. The campaign soooo damaged Dewhurst's political brand name that he was defeated for re-nomination by a 2-1 margin by a right wing (that's a good thing) state senator and radio talk show host Dan Patrick.
That's what Cruz did to the epitome of the GOP-E in Texas.