EMBED >More News Videos Sen. Cruz's campaign says it might be a long night, but he's confident he'll be re-elected.

HOUSTON, Texas (KTRK) -- Republican incumbent Sen. Ted Cruz has won his bid for re-election, ABC News projects.As polls closed across most of Texas, supporters of both candidates in the closely watched U.S. Senate race gathered at opposite ends of the state.Thousands of's supporters have been watching the election results at a minor league baseball stadium in the Texas Democratic senate candidate's native El Paso.At U.S.'s party in Houston, supporters were cautiously optimistic throughout Tuesday night before cheers erupted at news of the senator's victory.Cruz, a Houston native, has held his seat since 2013.In the months leading up to the election, polls have showed Cruz defeating O'Rourke by as many as nine points.On Election Day, some outlets, such as FiveThirtyEight predicted that Cruz, the incumbent, had a 7 in 9 chance of keeping the seat.