Silver State caucuses
Voting: Republicans, noon-1 p.m. EST today; Democrats, 2-3 p.m. EST.
Voters: Registered Democrats, 499,850; Republicans, 480,437; undeclared, 189,112.
At stake: 25 Democratic delegates; 31 Republican delegates.
Polls: Hillary Clinton narrowly leads Barack Obama, with John Edwards a distant third among Democrats; Mitt Romney holds a wide lead among Republicans; John McCain in second. 