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So here's where it really counts

Candidates need to secure the backing of 1,144 delegates at the Republican convention in the summer in order to take on President Barack Obama in November. Tonight, they'll fight it out for delegates across 10 key states.

Alaska 27 delegates

Georgia 76 delegates

Idaho 32 delegates

Massachusetts 41 delegates

North Dakota 28 delegates

Ohio 66 delegates

Oklahoma 43 delegates

Tennessee 58 delegates

Vermont 17 delegates

Virginia 46 delegates