Leah Proffitt, a 60-year-old Air Force veteran in Tucson, is a registered Republican who appreciates Mr. Trump’s business experience. But she is worried about the rising government debt, thinks big businesses have too much power and isn’t convinced that the economy is as good as official statistics suggest.

“I have a house, I’m not out on the street, I’ve got a job,” Ms. Proffitt, who works in air quality for the local Air Force base , said in an interview. “We’re doing O.K. But I don’t know that over all things are that good.”

Ms. Proffitt, who voted for Mr. Trump in the 2016 primary but for Hillary Clinton in the general election, said she wasn’t sure how she would vote next year. Right now, she said, the economy is not her “focal point” because she has a solid job. But if the economy turns south, that could change.

Consumer sentiment — as measured in both the Times poll and in several long-running surveys — remains relatively high, particularly among Republicans. Polls continue to show that voters approve of Mr. Trump’s handling of economic issues more than of his job performance over all.