Over the past several months, Pew collected data about the 2012 presidential election from nearly every state and the District of Columbia.
In November 2012, more than 1 million provisional ballots were issued in California, the most ever by any state. This was more than 8 percent of all ballots cast in the state. More than 175,000 of these were rejected.
Additionally, slightly more than half of the ballots cast in California were domestic absentee ballots, continuing a decades-long trend of more votes being cast statewide by mail.
Overall, however, both the state’s turnout rate of 55.5 percent and registration rate of 65 percent were among the lowest in the country in 2012.