The 2012 United States presidential election in Washington took place on November 6, 2012, as part of the 2012 United States presidential election in which all 50 states plus the District of Columbia participated. Washington voters chose 12 electors to represent them in the Electoral College via a popular vote pitting incumbent Democratic President Barack Obama and his running mate, Vice President Joe Biden, against Republican challenger and former Massachusetts Governor Mitt Romney and his running mate, Congressman Paul Ryan.

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2012 United States presidential election in Washington (state)

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Turnout	81.25% (of registered voters) 3.36%[1]
Nominee Barack Obama Mitt Romney Party Democratic Republican Home state Illinois Massachusetts Running mate Joe Biden Paul Ryan Electoral vote 12 0 Popular vote 1,755,396 1,290,670 Percentage 55.80% 41.03%
County Results Precinct Results Obama   40–50%   50–60%   60–70%   70–80%   80–90%   90–100% Romney   40–50%   50–60%   60–70%   70–80%   80–90%   90–100% Tie/No Data
President before election Barack Obama Democratic Elected President Barack Obama Democratic

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President Obama easily won the state of Washington, taking 55.80% of the vote to Mitt Romney's 41.03%, a 14.77% margin of victory.^[2] In terms of raw vote total, Obama received 1,755,396 votes to Romney's 1,290,670 votes, a 464,726 vote margin. Obama received the largest number of votes of any candidate up to that point, a record which would be broken by his then-running mate Joe Biden in 2020, when Biden broke Obama's record by 614,216 votes.^[3] Third parties collectively made up 79,450 votes, or 2.54%. Obama led in every single poll conducted, often by double digits. Washington has not voted for a Republican since Ronald Reagan carried it in his 1984 landslide, and today is considered part of the Blue Wall, a bloc of 242 electoral votes that have safely voted for the Democratic nominee since 1992. Despite being a Republican-leaning swing state in the early- to mid-20th century, the rise of cultural conservatism and resistance to social liberalism in the Republican Party pushed voters in Washington, as well as many other Blue Wall states, away from the Republicans.^[4]

As with all other Pacific states, Washington politics are dominated by its progressive metropolitan areas. Washington itself is one of the most progressive states in the country, most notably on women's issues: it was one of the first states to loosen abortion restrictions^[4] and is the United States' 7th most secular state.^[13] Economically, while Washington was historically a socially liberal and economically conservative state, it has become more dominated by leftism in the past few years at the presidential, congressional, and local level.^[4][14] Thus, an Obama win was near guaranteed. He dominated the Seattle–Tacoma metropolitan area, winning 69.07% of the vote (a 40.56% margin) in King County, the largest in the state and home to Seattle. King County alone casts 29% of the state's ballots, and the Seattle metropolitan area (as defined by the United States Census Bureau) comprised 69.66% of the state's population in 2012.^[15][16] This area of Washington also has the highest minority composition with a 15% Asian, 9% Hispanic, and 7% African American population, and is dominated by diverse, well-educated voters. The Seattle LGBT community is one of the largest in the country.^[4] Thurston County, the 6th largest county in the state and home to the state capital of Olympia, gave Obama 58.27% of the vote, a 19.48% margin. The Democratic ticket also won by great margins in the counties of (in decreasing order of margin) Snohomish (Everett), Whatcom (Bellingham), Kitsap (Bremerton), and Pierce (Tacoma). Clark County, home to Vancouver, in the southwest of the state, was won by the president with a 431-vote margin. Overall, Western Washington voted 7.7% more Democratic than the state overall.^[14]

Meanwhile, Romney's best performance was in the east of the state, which is mostly rural and sparse and has an economy dominated by agriculture. Washington's geographic divide resembles that of California and Oregon: voters east of the Cascade Mountains are the most conservative in Washington, and Eastern Washington voted 28.5% more Republican than the state as a whole.^[14] While comprising most of the counties in the state, this area casts only one-fifth of the ballots. Though many of these counties the Republicans won with over 60% of the vote, these victories were not able to offset Obama's landslide margins in the Seattle–Tacoma metro. Romney's biggest prize was Spokane County, which gave him over 115,000 votes and a 5.81% margin of victory. He also won Yakima County. However, he was able to flip four counties that Obama won in 2008: Klickitat, Skamania, Wahkhiakum, and Whitman. Obama thus became the first Democrat to win the White House without carrying Skamania or Wahkiakum Counties since Woodrow Wilson in 1916 and the first to do so without carrying Klickitat County since John F. Kennedy in 1960.

This election continued Clallam County's bellwether streak, marking the 9th election since 1980 that it voted for the winner of the nationwide election. Clallam's streak would eventually become the longest of any county in 2020.^[17] Washington weighed in as 11.01% more Democratic than the national average in 2012. As of the 2020 presidential election, this is the last presidential election in which the Republican nominee won Whitman County and the Democratic nominee won Cowlitz, Grays Harbor, Mason, and Pacific Counties. This is also the last time a Republican received more than 40% of the vote in Washington.

• United States presidential elections in Washington (state)
• 2012 Democratic Party presidential primaries
• 2012 Republican Party presidential primaries
• Results of the 2012 Republican Party presidential primaries
• 2012 Republican Party presidential debates and forums