Louisianans vote Saturday in a Republican Senate runoff to determine the party’s nominee to replace Sen. Bill Cassidy. Cassidy is not advancing after failing to win a majority in the May primary. Two candidates move forward from the initial contest: GOP Rep. Julia Letlow and Louisiana state treasurer John Fleming. In the primary, neither Letlow nor Fleming received more than 50 percent of the vote, which triggers the runoff. Cassidy finished in third place in that election, leaving the runoff between the two top primary finishers. The winner of Saturday’s runoff will advance as the Republican contender for the U.S. Senate seat in the general election, though the outcome of that broader race depends on the results of other party contests. Live returns and vote counts are expected to be reported throughout the day as polling progresses across the state.