Arizona's largest county is expecting a low voter turnout during the state's primary election.
Maricopa County recorder Helen Purcell said Tuesday that roughly 7 percent of registered voters are expected to cast ballots at polling locations. She said voter turnout is around 30 percent if early ballots are included.
Tuesday is primary election day in Arizona, with Republicans deciding their U.S. Senate nominee and voters in both major parties deciding contested races in U.S. House districts.
Polls are open from 6 a.m. to 7 p.m. Early ballots accounted for more than half of the voters cast in the 2010 primary.
Republicans have a four-way race for the nomination for the Senate seat being vacated by Republican incumbent Jon Kyl. He's retiring and not running for a fourth term.