Republican presidential candidate, former Pennsylvania Sen. Rick Santorum speaks before the American Israel Public Affairs Committee (AIPAC), in Washington, Tuesday, March 6, 2012. (AP Photo/Charles Dharapak)LAURIE KELLMAN
WASHINGTON (AP) - Rick Santorum has won North Dakota's Republican presidential caucuses, adding to his wins in Tennessee and Oklahoma.
Rival Mitt Romney has also won three state contests - Massachusetts, Virginia and Vermont. The two are battling in a close race for Ohio. A total of 10 states are voting on Super Tuesday.
Earlier, Newt Gingrich won the GOP contest in his home state of Georgia.