After the U.S Democrat Mark Kelly was declared the winner of his Senate re-election race in Arizona, the outcome of a tight race in Nevada will determine whether Democrats can secure a majority in the upper congressional chamber without having to hold their breath until the December runoff in Georgia.

The race between Nevada’s Democratic incumbent, Catherine Cortez Masto, and her Republican challenger Adam Laxalt, the state’s former attorney general, got even closer over the weekend when a batch of counted votes were reported. Just 862 votes make up Laxalt’s lead.

About 25,000 mail-in ballots and 15,000 ballots that need “curing”, or correcting by the voter, have yet to be reported. The bulk of the remaining ballots will come from Clark county, home to largely Democratic Las Vegas. Drop-off and mail-in ballots for the race so far have also favored Cortez Masto, upping the chances that she will keep her seat.

If Democrats win this seat in Nevada, they along with Democratic-leaning independents will have 50 seats in the Senate. The vice-president, Kamala Harris, who presides over the Senate, can serve as a tie-breaker in any 50-50 votes. Many of the remaining ballots are expected to be counted and reported by Saturday, though the deadline for counting the remaining ballots is on Tuesday.