North Carolina Senate candidate Thom Tillis backed selling birth control without a prescription at a debate Wednesday, the latest Republican to back an idea aimed at winning over women voters.

In a debate with Democratic Sen. Kay Hagan, Tillis said he supports making birth-control pills available over the counter, making him at least the fourth GOP Senate candidate this year to support the move.

"I actually agree with the American Medical Association — we should make contraception more widely available," he said. "I think over-the-counter, oral contraception should be available without a prescription. If you do those kinds of things it will actually increase the access and reduce the barriers for having more options for women for contraception."

Colorado Republican Senate candidate Cory Gardner voiced his support in a new TV ad Tuesday.

During a July debate GOP Senate candidate Ed Gillespie of Virginia voiced his support for over-the-counter birth control. Mike McFadden, who is running against Democratic incumbent Al Franken in Minnesota, made a similar argument weeks later in an interview.

The idea was first pushed by Louisiana Republican Gov. Bobby Jindal in 2012.