2018Final results
2018 election for U.S. Senate in Washington
U.S. Senate · Washington
Maria Cantwell (D) won with 58.4% of the vote, defeating Susan Hutchison (R) by 16.9 points.
Maria CantwellDemocrat · winner
58.4%1,802,779
Susan HutchisonRepublican
41.5%1,282,006
3,086,786 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
The seat over time
D − R margin in this seat's races around 2018
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Maria CantwellSusan Hutchison
$9.4M
Raised by the campaign
$1.9M
$9.6M
Spent by the campaign
$1.9M
$569.9K
Cash on hand
$0
Campaign money: FEC, through Dec 31, 2018.
Source: FEC campaign filingsUpdated Dec 31, 2018