(ABC News) The stunning Texas victory of Ted Cruz, a young Tea Party-backed Republican over an establishment candidate vying for a Senate seat, has already so emboldened the insurgent conservative movement that activists are warning Mitt Romney he had better get on board.

“These guys [newly elected Tea Party candidates]” are going to force Romney to the right,” said Andrea Shell, a spokeswoman for Tea Party group Freedom Works. “That is our entire mission.”

Cruz won the Texas Republican primary Tuesday night. In Texas, winning the Republican nomination is a virtual lock on a Senate election.

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