Sen. Ted Cruz, R-Texas speaks, during a campaign stop at the Freedom Country Store on Tuesday, Jan. 19, 2016, in Freedom, N.H. John Minchillo AP
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“It wasn’t the best week for Cruz, but I think he was able to turn the Branstad anti-endorsement at least partially to his advantage by presenting it as evidence that Ted Cruz is the candidate the establishment fears,” said Mark P. Jones, political science professor at Rice University.

Despite the momentum being in Trump’s favor, Jones said, “While Cruz may be second in the polls in Iowa, he is right on Trump’s heels.”

And, others say, Cruz could lose Iowa and not be too hurt.

“Cruz is far from having Iowa, let alone the nomination, in the bag,” said James Henson, director of the Texas Politics Project, University of Texas at Austin.

“But I think the conventional wisdom that he must finish first in Iowa is overblown,” Henson said. “It’s very hard to imagine him finishing in the top two in Iowa and in the top three in the other three early contests, and not continuing on to Texas and Super Tuesday.”