Additional tabulations under Maine’s new voting system are needed to determine the winner of Maine’s 2nd Congressional District race between Republican U.S. Rep. Bruce Poliquin and Democrat Jared Golden.

Neither candidate collected a majority of first-place votes under Maine’s ranked-choice voting system, which was used for the first time Tuesday in U.S. House and Senate races.

That’s triggering additional voting rounds in which last-place finishers in the four-way race are eliminated and the votes are reallocated.

Secretary of State Matt Dunlap said those calculations, aided by computers, will take place next week. He’s not committing to a specific timeline.

The race was the most expensive Congressional contest in Maine history, and about 150 votes separated Poliquin and Golden.