NBC and the Associated Press have both projected Hillary Clinton a winner in Ohio.

The Latest on the 2016 primary election in Ohio (all times local):

8:45 p.m.

Hillary Clinton has won the Democratic presidential primary in Ohio, earning her third win in Tuesday's quintet of contests.

Clinton already scored victories in Florida and North Carolina, earning 175 additional delegates before winning Ohio.

Contests in Missouri and Illinois have not yet been decided.

8:25 p.m.

Ohio's Republican U.S. senator has won the nomination in his bid for re-election.

The Associated Press is projecting that Rob Portman of the Cincinnati area has defeated a little-known challenger in Ohio's primary.

The first-term senator will face the winner of the Democratic Senate primary in what has already been a hotly contested, high-spending race. It's expected to be pivotal as Democrats try to regain Senate control.

Portman had 84 percent of the vote to 16 percent for Don Elijah Eckhart of the Columbus area with less than 1 percent of precincts reporting unofficial returns Tuesday evening.

Eckhart is a former legislative service commission employee.

Portman's campaign has been anticipating a general election battle with former Gov. Ted Strickland, a fellow former congressman who faced two primary opponents.

8:10 p.m.

A spokesman for the secretary of state says a federal judge has ordered polls in four southwest Ohio counties to stay open for an extra hour because of a traffic problem in the region, which includes Cincinnati.

Spokesman Josh Eck says polls in Butler, Clermont, Hamilton and Warren counties will remain open until 8:30 p.m. under the order. Polls had been scheduled to close at 7:30 p.m.

Eck says election results won't be delayed because of the change.

Gov. John Kasich's (KAY'-siks) presidential hopes are riding on winning Tuesday's primary, with other Republicans hoping he can help slow businessman Donald Trump's drive to the nomination. On the Democratic side, Bernie Sanders is hoping to spring another upset over Hillary Clinton.

6:05 p.m.

An elections official in a northeast Ohio Democratic stronghold says additional GOP primary ballots have been printed to cover increased demand there.

Thomas McCabe is deputy director of the Mahoning County Board of Elections. McCabe says roughly 6,000 additional Republican ballots were printed for certain precincts based on voter turnout for Tuesday's election. He says that's on top of about 42,000 Republican ballots initially printed for the primary.

McCabe, a Republican, says he doesn't anticipate all the extra ballots will be used. The county that encompasses Youngstown has about 14,000 registered Republicans.

McCabe says about 4,300 GOP ballots have been cast early - twice that in previous presidential primaries. About half of those were from registered Republicans. The remaining Republican ballots were cast early by a mix of Democratic and unaffiliated voters.

5 p.m.

A Bernie Sanders supporter in northeast Ohio has flexed his muscles for his Democratic presidential primary pick.

A spokesman for Republican Secretary of State Jon Husted (HYOO'-sted) says a Stark County man ripped off his Sanders shirt and voted bare-chested after he was told by a poll worker that he couldn't wear political paraphernalia into the polling place.

Husted spokesman Josh Eck says, typically, most people choose to turn their shirts inside out and then vote.

2:45 p.m.

Cleveland police say a poll worker has been arrested after he got into an argument with other workers and pulled a gun from his backpack at a voting site.

Authorities said the 45-year-old man did not point the weapon directly at anyone, but he made verbal threats at about noon Tuesday. He was arrested shortly after leaving the polling place and taken to jail.

Police said they found the gun and a small amount of marijuana in the man's backpack.

Cleveland police spokeswoman Sgt. Jennifer Ciaccia (chawch) says it is unclear what the argument was about. She didn't know whether voters were at the Louisa May Alcott School's voting site at the time.

Dennis Anderson of the Cuyahoga (ky-uh-HOH'-guh) County Board of Elections says the polling location remains open.

11 a.m.

Voting in the Cleveland area in northeast Ohio appeared to be moving more slowly than in some other areas of the state.

Cuyahoga County elections director Pat McDonald said Tuesday that voting had been a "little slow" so far. He attributes that to the weather on a gloomy gray day with intermittent rain. McDonald says he expects turnout to pick up later in the day with an overall turnout of around 41 percent, which is comparable to presidential primaries in 2008 and 2012. McDonald says about 15 percent of early voters in the heavily Democratic County had asked for Republican primary ballots.

Cleveland voter Charlotte Cousett said she voted for Democrat Hillary Clinton. The 67-year-old Democrat said she believes Clinton has the necessary experience and a woman should have a chance to be president.

"We work just as hard as men do," she said.

10:40 a.m.

Ohio election officials say county election boards weren't reporting any major problems at polls around the state as voters cast ballots in the 2016 primary.

Josh Eck, a spokesman for Ohio Secretary of State Jon Husted (HYOO'-sted), says the checks by Husted's office with various county boards on Tuesday morning also showed several boards across Ohio were expecting fairly strong turnout.

In central Ohio, voting was described as fairly steady. Franklin County Board of Elections spokesman Ben Piscitelli (pihs-kuh-TEL'ee) said no major problems had been reported Tuesday morning.

Two Democrats voting in Columbus chose opposing Republican candidates. Democrat William McMillen said he voted for Republican front-runner Donald Trump because he thinks that the businessman could "make money for America." Democrat C. J. Leppert said she "held my nose" and voted for Gov. John Kasich (KAY'-sik) to try to keep Trump from winning. She plans to vote as a Democrat in the fall.

8:45 a.m.

Ohio Secretary of State Jon Husted (HYOO'-sted) says that more than 417,000 voters had cast ballots by the close of early voting.

Husted says more than 500,000 absentee ballots were requested by-mail and in-person for Tuesday's primary. Early voting closed Monday.

The informal survey of the state's 88 county board of elections on Monday also showed that Democrats requested more than 226,000 absentee ballots and cast over 187,000. Husted's office says more than 258,000 Republicans requested absentee ballots with more than 222,000 cast.

Husted says more than 335,000 voters cast their ballots early during the 2012 presidential primary.

7:40 a.m.

Polls have opened in Ohio with Gov. John Kasich (KAY'-sik) and other Republican candidates hoping to slow down businessman and front-runner Donald Trump.

The director of the Hamilton County Board of Elections says the Cincinnati-area polls in the southwest county opened on time at 6:30 a.m.

Director Sherry Poland says people were in line before polls opened at some locations. Poland says voting seems to be moving smoothly with election officials predicting around a 40 to 45 percent turnout before polls close at 7:30 p.m.

Kasich is counting heavily on his home state to give him his first win in the campaign as he goes up against Trump and the other Republican candidates in the presidential race. Bernie Sanders is challenging Hillary Clinton on the Democratic side.

6:00 a.m.

Ohio voters are once again in the national spotlight.

Gov. John Kasich's (KAY'-siks) presidential hopes are riding on winning Tuesday's primary, with other Republicans hoping he can help slow businessman Donald Trump's drive to the nomination.

Bernie Sanders is hoping to spring another upset over Hillary Clinton on the Democratic side.

The state's U.S. Senate Democratic primary has national implications, too.

Former Gov. Ted Strickland wants to win the Senate primary to set up a race with Republican incumbent Rob Portman that could be pivotal in the battle for a Senate majority.

In the western part of the state, 15 Republicans are vying to succeed former House Speaker John Boehner in the seat he held since 1990.

Copyright 2016 The Associated Press. A