American Idol alum Clay Aiken received the most votes Tuesday in the Democratic primary for the U.S. House in North Carolina's 2nd congressional district, but a narrow lead has kept the AP from declaring him the winner.

“Democratic congressional primary race in North Carolina featuring Clay Aiken too close to call,” the news agency tweeted early Wednesday morning.

With 100 percent of precincts reporting, Aiken received 11,649 votes (40.84%), while his closest rival, former state Commerce secretary Keith Crisco, received 11,277 (39.53%).

Candidates in North Carolina must receive 40 percent of the vote to avoid a run-off election.

The 35-year-old Aiken, who is looking to unseat Rep. Renee Ellmers, a Republican, thanked supporters on Tuesday night.

“We are feeling incredibly comfortable tonight. We are comfortable not only with the results we've seen this evening. We are comfortable not only with how we'll feel tomorrow morning. But more than anything, we're comfortable with the way this campaign was run,” Aiken said.

Aiken, who came out gay in 2008, five years after his second-place Idol finish, on the cover of People magazine, announced his congressional bid in a video on February 5. In the 5-minute video, he said that he does not believe his sexual orientation will become a campaign issue.