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“I try to post two or three times a week, because it takes hours to hit a shot,” Mr. Shields, of Urbandale, Iowa, said.

After a Haley campaign stop in Waukee, Iowa, last week, Bruce Norquist, a 60-year-old cybersecurity consultant from Urbandale, Iowa, said that Ms. Haley was not strong, citing the threats posed to the country by disinformation campaigns from China and Russia and what he said were efforts to tamper with voting machines.

“We don’t want to take any chances,” he said in an interview at the Machine Shed restaurant in Urbandale on Thursday, where the former president’s eldest son, Donald Trump Jr., rallied supporters.

Ruth Ann Cherny, 65, a retired nurse from Urbandale, Iowa, said she was turning back to Mr. Trump after considering whether the party had “a younger, dynamic guy.”

Jennifer Turner, 41, from Urbandale is a Ron DeSantis supporter.