Democrat concedes defeat in crucial Senate seat Cal Cunningham had been considered the front-runner in North Carolina until his campaign was undermined by a sex scandal. Tillis Ekes Out Victory in North Carolina, Bolstering Republicans’ Hold on the SenateSenator Thom Tillis defeated Cal Cunningham after an expensive and hard-fought race, which was scrambled in the final weeks by revelations that Mr. Cunningham had an extramarital affair. Tillis wins North Carolina Senate raceSen. Thom Tillis (R-N.C.) on Wednesday was projected to have held back a challenge from Democrat Cal Cunningham, delivering a further blow to Democrats' hopes of flipping the Senate. Analysis: Why the Senate is so tough for DemocratsThe expected twin Georgia runoff elections in January that will determine control of the Senate encapsulate the structural challenge facing Democrats as they battle to secure a majority in the chamber that could determine the shape of Joe Biden's presiden Sen. Thom Tillis wins re-election against Cal Cunningham in North CarolinaIt's a key victory in Republicans' bid to retain control of the Senate. Control of the Senate heads into overtime as Georgia braces for runoff electionsGOP Sen. David Perdue, running for a second term, fell below the 50 percent threshold required by state law and likely will face Democrat Jon Ossoff in a Jan. 5 runoff. Cal Cunningham concedes to Senator Tillis in North Carolina - The Boston GlobeDemocrat Cal Cunningham conceded to incumbent Republican US Senator Thom Tillis in North Carolina on Tuesday, saying “the voters have spoken” and it was clear Tillis had won. GOP Sen. Tillis reelected to North Carolina seat, boosting GOP chances to keep majority. Cunningham concedesTillis fended off Democrat Cal Cunningham in a race Democrats had a serious chance of flipping in their quest to retake control of the Senate.