U.S. Sen. Maria Cantwell is likely to clinch her third term in the U.S. Senate, while the race for one of Washington's redrawn congressional districts remains a toss-up.

Cantwell, a Democrat, has led Republican newcomer Michael Baumgartner in the polls and in fundraising since the beginning of the campaign season.

In the newly redrawn 1st Congressional district, Democrat Suzan DelBene faces Republican John Koster Tuesday in the state's closest congressional race.

Spanning from the suburbs of King County to the Canadian border in Whatcom County, the sprawling and redrawn district was seen as a toss-up throughout the election.

DelBene, a former Microsoft executive, defeated a group of Democrats in the primary to challenge Koster, who faced little opposition from his own party. DelBene has used more than $2 million of her own money in the campaign.