North Carolina's Republican primary field to face Sen. Kay HaganKay HaganLinking repatriation to job creation Former Sen. Kay Hagan in ICU after being rushed to hospital GOP senator floats retiring over gridlock MORE (D-N.C.) got a little smaller after conservative radio host Bill Flynn (R) dropped his bid Thursday.

His decision may make it slightly easier for North Carolina House Speaker Thom TillisThom R. TillisGOP senators unveil bill to give Congress control of consumer bureau budget GOP senators to Trump: We support 'maintaining and expanding' Gitmo Senators to Mattis: Push for exemption to Trump immigration order MORE (R) to win the crowded GOP primary in the first round of voting. If no candidate wins 40 percent of the vote in North Carolina, a runoff is triggered, which could be costly for all candidates involved and hurt the GOP's chances in the race.

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Flynn cited fundraising struggles as his reason for dropping out.

"Though deeply appreciative of every gift and effort made on behalf of this campaign, I have failed to secure the depth of funding essential to continue in this primary race," he told the Charlotte Observer on Thursday afternoon. "Washington's deficit spending approach can be no part of a Senate campaign dedicated to conservative principles."

Though Flynn is out, a crowded primary field remains. Tillis is facing off against Tea Party favorite Greg Brannon (R), who has Sen. Rand Paul's (R-Ky.) endorsement; Minister Mark Harris (R), who has the backing of Arkansas Gov. Mike Huckabee (R); and Republicans Heather Grant, Ted Alexander and Edward Kryn.