Thom Tillis

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Republican senatorial candidates from left, Thom Tillis, Heather Grant, Greg Brannon and Mark Harris participate during a televised debate at WRAL television studios in Raleigh, N.C., Wednesday, April 23, 2014. (AP Photo/Gerry Broome, Pool)

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North Carolina Republican senatorial candidate Greg Brannon, second from right, responds during a live televised debate at WRAL television studios as Thom Tillis, left, Heather Grant, and Mark Harris, right, listen in Raleigh, N.C., Wednesday, April 23, 2014. (AP Photo/Gerry Broome, Pool)

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Republican senatorial candidate Thom Tillis answers a question during a debate at Davidson College in Davidson, N.C., Tuesday, April 22, 2014. (AP Photo/Charlotte Observer, Todd Sumlin, Pool)

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Republican senatorial candidates, from left, Mark Harris, Heather Grant, Greg Brannon, and Thom Tillis, arrive at their spots before a debate at Davidson College in Davidson, N.C., Tuesday, April 22, 2014. (AP Photo/Chuck Burton)

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Republican senatorial candidate Thom Tillis, right, has a "selfie" taken with a supporter before a debate at Davidson College in Davidson, N.C., Tuesday, April 22, 2014. (AP Photo/Chuck Burton)

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In this Thursday, March 6, 2014 photo, North Carolina House of Representatives Speaker Thom Tillis, R-Mecklenburg, addresses attendees during Wilson County's Republican Convention, held on the campus of Wilson Community College in Wilson, N.C. As one of the architects of the Republican revolution arriving in Raleigh three years ago, Tillis has received both praise and consternation among Republicans during his U.S. Senate campaign. (AP Photo/The Wilson Times, Brad Coville)

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