 All elections in Louisiana—with the exception of U.S. presidential elections—follow a variation of the open primary system called the jungle primary.Candidates of any and all parties are listed on one ballot; voters need not limit themselves to the candidates of one party when voting.Unless one candidate takes more than 50% of the vote in the first round, a run-off election is then held between the top two candidates, who may in fact be members of the same party.