LINCOLN, Neb. (AP) — An effort to reinstate the winner-take-all system in presidential elections has cleared a first-round vote in Nebraska’s Legislature.

Lawmakers voted 31-17 on Monday to advance the bill through the first of three required votes. Supporters of the bill overcame a legislative filibuster.

Nebraska and Maine are the only states where it’s possible to split electoral votes between opposing presidential candidates, though other states have considered the practice. Two of Nebraska’s electoral votes are awarded to the statewide winner, while the remaining three are distributed by congressional district.

Nebraska split its electoral votes for the first time in 2008, when Democrat Barack Obama captured one from the 2nd congressional district in Omaha on his way to the presidency.