Updated: April 24, 2014 at 5:08 pm
DENVER — A neurosurgeon says he wants to run as an independent in Colorado's U.S. Senate race.
Steve Shogan announced his candidacy Thursday. He needs to gather 1,000 signatures to be placed on the November ballot to challenge Democratic Sen. Mark Udall. Republican Rep. Cory Gardner is already in the race.
A poll Thursday showed Gardner just one percentage point behind Udall.
Shogan is chief of neurosurgery at Rose Medical Center. It is unclear how much of a factor he would be in what is shaping up as one of the nation's most competitive senate races. Republicans and Democrats and their backers are expected to spend as much as $50 million on the contest.
Shogan's campaign manager said he will raise funds and spend some of his own money on ads.