Kasich beats Trump in Ohio
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Republican presidential candidate John Kasich is projected to win the Ohio primary, knocking off rival Donald TrumpDonald John TrumpAssange meets U.S. congressman, vows to prove Russia did not leak him documents A history lesson on the Confederacy for President Trump GOP senator: Trump hasn't 'changed much' since campaign MORE to secure a critical victory that increases the likelihood of a contested convention.

Kasich's win gives him all 66 of the state's GOP delegates.

Fox News and CNN called the race at about 8:45 p.m. EDT, just over an hour after polls closed.

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The Ohio governor was fighting for his political life. He had said that he would end his campaign if he lost on his home turf Tuesday.

Kasich got a late assist on the trail from 2012 GOP presidential nominee Mitt Romney, who campaigned at his side.

And rival Marco RubioMarco RubioScarborough: Trump has chosen the 'wrong side' THE MEMO: Trump reignites race firestorm RNC spokeswoman: GOP stands behind Trump's message 'of love and inclusiveness' MORE, who had practically no chance iof taking n Ohio, had told supporters in the state to vote for Kasich to try to keep the state's delegates out of Trump's hands.

Trump's loss makes it tougher for the businessman to clinch the nomination outright before the GOP convention. He gains no delegates from Ohio because of the winner-take-all rules.