The survey, conducted by the Phoenix-based pollster OH Predictive Insights, shows McSally drawing 45 percent of the vote compared with 44 percent for Kelly. The poll of 600 likely voters carried a margin of error of plus or minus 4 percentage points.

“In this dogfight between two former military pilots, Mark Kelly is on Sen. McSally’s six and closing,” said Mike Noble, OH’s chief of research.

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Seven months after she lost a closely fought battle against Sen. Kyrsten Sinema (D), most voters have formed an opinion about McSally. Fifty-one percent of voters see her favorably, and 40 percent see her unfavorably.

Kelly, making his first run for public office, is less well-known. More than a third, 38 percent, have no opinion of the likely Democratic nominee. Forty-two percent see him favorably, and 20 percent view him unfavorably.

Kelly, the husband of former Rep. Gabrielle Giffords (D), raised more than $4 million in his first weeks as a candidate, according to reports filed with the Federal Election Commission. McSally raised $2.1 million in the first quarter of the year.

The poll was conducted May 1–2.