EXPLAINER: How Warnock won 1 of Georgia’s 2 Senate runoffs

Two U.S. Senate runoff elections that together will determine which party controls the legislative chamber for the next two years have been held in Georgia, and a Democrat has won one of them. The Associated Press declared Democrat Raphael Warnock the winner of one of the races over appointed Republican Sen. Kelly Loeffler, a contest that will send him to Washington to finish the remainder of retired GOP Sen. Johnny Isakson’s term. The other race between Republican David Perdue, who is see