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.