What you need to know about the California recall

California voters head to the polls on Tuesday to decide whether to recall Democratic Gov. Gavin Newsom.

Millions of voters have already cast their ballots -- all registered voters in the state were mailed one -- and so far, Democrats have outpaced their registration advantage in the overwhelmingly blue state. But Republicans are counting on doing better on Election Day because of their party's preference for voting in-person. The first and only successful gubernatorial recall in the state was in 2003, when Californians voted to oust Democratic Gov. Gray Davis and replace him with Republican Arnold Schwarzenegger.