Which party will control the majority of seats as a result of the 2018 U.S. Senate elections? Note: A majority of seats requires either party to control at least 51 of the 100 Seats in the U.S. Senate. Independent or any other party Representatives caucusing with either the Democrats or Republicans will NOT count for the purposes of this market. Unmatched bets will not be cancelled at any point up until the stated time on the day of election when this market will be turned in-play. Thereafter, the market will not be actively managed and users are responsible for their positions.