2006Final results
2006 election for U.S. Senate in Washington
U.S. Senate · Washington
Maria Cantwell (D) won with 56.9% of the vote, defeating Mike McGavick (R) by 16.9 points.
Maria CantwellDemocrat · winner
56.9%1,184,659
Mike McGavickRepublican
39.9%832,106
Bruce GuthrieLibertarian
1.4%29,331
Aaron DixonGreen
1.0%21,254
Robin AdairIndependent
0.8%16,384
2,083,734 votes
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
The seat over time
D − R margin in this seat's races around 2006
Races before and after
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Maria CantwellMike McGavick
$13.7M
Raised by the campaign
$10.9M
$14M
Spent by the campaign
$10.8M
$146.5K
Cash on hand
$11.1K
Other candidates' campaigns: Bruce Guthrie $1.3M · Aaron Dixon $87.7K · Robin Adair $16.2K.
Campaign money: FEC, through Dec 31, 2006.
Source: FEC campaign filingsUpdated Dec 31, 2006
The candidates
Maria Cantwell (D)Mike McGavick (R)
Also on the ballot: Bruce Guthrie (Libertarian), 1.4%; Aaron Dixon (Green), 1.0%; Robin Adair (Independent), 0.8%