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Senatorial Candidate | Political Party | Popular Vote |
| Maria Cantwell | Democratic |
1,803,364 |
58.43% |
| Susan Hutchison | Republican |
1,282,804 |
41.57% |
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Map Key
| Turnout
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| Election Data and Statistics:
| Election Tools
- Atlas Forum Image Code for Maps: County, CD, Pop, Tnd, Swg
Data Sources:
- Source for Popular Vote data: Washington Secretary of State. November 6, 2018 General Election Results, Washington Secretary of State (http://results.vote.wa.gov/results/current/US-Senator_ByCounty.html) (accessed 08 Dec 2018)
- Source for Population data: U.S. Census Bureau.
| Results for and Individual County:
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The 2018 Campaign:
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