A second Republican poll today showed Rep. Jeff Flake (R) leading former surgeon general Richard Carmona (D) in the open-seat Senate race in Arizona.

Flake takes 47 percent to Carmona’s 41 percent, with undecided voters accounting for 12 percent in the survey paid for by the National Republican Senatorial Committee’s independent expenditure unit.

The survey marks the second GOP poll and third internal poll released today. The Democratic Senatorial Campaign Committee released a survey showing Carmona with a 4-point lead. But Flake’s own campaign polling gave him a 6-point lead in surveys taken the same days, Oct. 7-9.

Regardless, the dueling numbers are a sign of an increasingly competitive race. Roll Call rates this race as Leans Republican.

In the NRSC’s IE poll, respondents reported a more favorable impression of Flake. Forty-five percent deemed Flake favorable, while  36 perent gave Carmona a favorable rating.

GS Strategy Group conducted the poll of 500 likely voters Oct. 8-9. The margin of error is about 4.4 points, according to the polling memo obtained by Roll Call.