Voting: 7 a.m. to 7 p.m. today (8 a.m. to 8 p.m. EST in 10 counties in Central Time Zone).
Voters: 3.8 million registered Republicans, 4.1 million registered Democrats, 2.2 million registered other.
At stake: 57 Republican delegates, 0 Democratic delegates (National Democratic Party stripped all delegates because the state party broke rules when it moved primary to before Feb. 5).
Polls: Among Republicans, John McCain and Mitt Romney are neck-and-neck, with Rudy Giuliani and Mike Huckabee battling for third.
Among Democrats, Hillary Clinton holds a double-digit lead over Barack Obama, with John Edwards in third.
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