2008 United States presidential election in California|
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| Turnout | 79.42% (of registered voters)  3.38 pp   59.22% (of eligible voters)  2.19 pp | 
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Congressional district results 
 
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 Obama 
  40–50% 
  50–60% 
  60–70% 
  70–80% 
  80–90%  | 
 McCain 
  50–60% 
  60–70% 
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   | 
 
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The 2008 United States presidential election in California took place on November 4, 2008, in California as part of the 2008 United States presidential election. Voters chose 55 electors, the most out of any of the 50 states, to the Electoral College, who voted for president and vice president.
California was won by Democratic nominee Barack Obama with a 24.1% margin of victory. No Republican has carried the state in a presidential election since George H. W. Bush in 1988. Prior to the election, California was considered to be a state Obama would win or as a safe blue state. With its 55 electoral votes, California was Obama's largest electoral prize in 2008. A number of media outlets called Obama for the West coast states including Hawaii, Oregon, and Washington, declared him president-elect.
As of the 2024 presidential election, this is the last time the Democratic candidate carried Trinity County in a presidential election. This was also the first time since 1936 that a Democratic presidential candidate won more than 60% of the vote in California, which the Democrats have done in every election since, except for 2024.