But regardless of how the contest turns out, Munisteri says the party will rally around their nominee, who is expected to walk over the Democratic candidate in Texas' general election.
"I am optimistic that two or three weeks after the run-off is over, the hard feelings will subside and everybody will come together and it's pretty easy to get people united with the idea that we need to get rid of Harry Reid," he says.
He also predicts that Cruz has run an impressive enough campaign to keep him and the tea party relevant.
"Win or lose, Ted Cruz is going to run a strong enough campaign that it's going to signal to people that grassroots still matter, organization on the ground still matters and money is not everything," Munisteri says. "It just shows that old fashioned retail politics still matters. And I think it will embolden people to challenge people to challenge more incumbents nationwide."
Rebekah Metzler is a political writer for U.S. News & World Report. You can contact her at firstname.lastname@example.org or follow her on Twitter.