With a week to go before the North Carolina Republican primary for U.S. Senate, Thom Tillis has broken 40 percent support, according to a new poll. Tillis, the state speaker of the house, has 46 percent support, with top rivals Greg Brannon and Mark Harris receiving 20 percent and 11 percent, respectively. The finding comes from PPP, a Democratic polling firm based in North Carolina.

North Carolina Republicans go to the polls on May 6 to determine who will be their nominee to face incumbent Democrat Kay Hagan in November's election. There are 8 GOP candidates, and the top vote-getter needs to win at least 40 percent of the vote to avoid a runoff. Tillis has led the field in nearly every poll, but this is the first to show him breaking that 40 percent threshold.

Tillis will get a big boost from the U.S. Chamber of Commerce, which has long been expected to back the Charlotte-area Republican and is launching TV ads supporting him in this final week of the primary campaign.

Most polls show a close contest between Tillis and Hagan for the general election, and the race is one of the top campaigns for both parties heading into November.

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