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DEVELOPING: Source tells NBC News that Israel has carried out an operation inside Iran

NBC News projects Romney in Massachusetts; Oklahoma, Tennessee too early to call

UPDATE:  NBC News projects Mitt Romney as the winner in Idaho (11:12 p.m. ET)UPDATE:  NBC News projects Rick Santorum as the winner in North Dakota (10:30
NBC News projects Romney in Massachusetts; Oklahoma, Tennessee too early to call
NBC News projects Romney in Massachusetts; Oklahoma, Tennessee too early to call
By Steve Frank, Steve Frank

UPDATE:  NBC News projects Mitt Romney as the winner in Idaho (11:12 p.m. ET)

UPDATE:  NBC News projects Rick Santorum as the winner in North Dakota (10:30 p.m. ET)

UPDATE:  NBC News projects Rick Santorum as the winner in Oklahoma (8:46 p.m. ET)

UPDATE:  NBC News projects Rick Santorum as the winner in Tennessee (8:34 p.m. ET)

NBC News projects Mitt Romney as the winner in Massachusetts, the state where he served as governor, but the races in Oklahoma and Tennessee are too early to call and Ohio is too close to call.