A new internal poll released Tuesday night by the Senate campaign of former Surgeon General Richard Carmona showed the Arizona race to be in a statistical tie. Rep. Jeff Flake is the Republican nominee and has, until recent weeks, been considered a likely bet to replace retiring Sen. Jon Kyl (R).

Flake led Carmona by 1 point in the poll. Forty-four percent of those surveyed said they backed Flake, while 43 percent backed Carmona. Three percent said they supported a libertarian candidate.

Flake and Carmona have net positive ratings. Thirty-eight percent of respondents had a favorable impression of Flake, while 32 percent had an unfavorable impression of him. As for Carmona, 34 percent viewed him positively, while 15 percent had a negative view of him.

The poll was conducted by Anzalone Lizst Research from Sept. 18-23. The live-interview survey included 600 likely voters. The margin of error was 4 points.