Plying Voters With Free Food, Ramaswamy Struggles to Win Them Over

The hectic travel schedule has often caused delays and, at times, canceled events — alienating potential supporters.

“If he can’t show up on time, he can’t be president,” said one man at a diner in Vinton, Iowa, who left before Mr. Ramaswamy, who was 30 minutes late, arrived. At that same event, a woman walked out midway through his stump speech, saying, “Hogwash,” to a campaign staff member on her way out.

He has retooled his stump speech to make central his discontent with the Republican National Committee, which he has claimed doesn’t want him in the race, and has recently been prompting crowds to ask him about his foreign policy vision, an area in which his inexperience has been highlighted by Ms. Haley and other rivals. He has used those questions to highlight his closeness to Mr. Trump, while his criticism of the “R.N.C. establishment” offers echoes of Mr. Trump’s own criticisms of the party apparatus.

That message resonated with Kristine Pfab, a 57-year-old from Bernard, Iowa, who said Republicans had become “just as swampy” as Democrats. But asked who she would caucus for, she said, “Probably DeSantis. “But if I could roll Vivek and DeSantis into one person, that would be great,” she added.

Jimmy Centers, a Republican strategist in Iowa, said Mr. Ramaswamy’s decision to run as a “Trump lite” candidate, in addition to the backlash for invoking Ms. Haley’s daughter recently on the debate stage, were two factors that could hurt Mr. Ramaswamy. Voters, seeing little daylight between Mr. Trump and Mr. Ramaswamy, frequently ask why he would run against the man he proclaims was the “best president of the 21st century.”