Wisconsin polls are scheduled to close at 8 p.m. but state election officials are stressing that anyone in line then will still get to vote in the state's historic recall contests.
The state Government Accountability Board has been reporting long lines and heavy turnout as Republican Gov. Scott Walker and four other GOP officeholders face recall challengers.
Walker faces a rematch with Democratic Milwaukee Mayor Tom Barrett, whom he beat in 2010 by 5 percentage points.
The board expects up to 65 percent of Wisconsin's eligible voters to turn out.
Board spokesman Reid Magney said anyone waiting in line when the polls close at 8 p.m. will still be allowed to register if necessary and vote.