10 States Hold Primaries or Caucuses for Super Tuesday

Voters line up to cast their ballots in the Republican primary at Medlock Bridge Elementary School, on Super Tuesday, March 6, 2012, in Johns Creek, Georgia. (AP)

Republican presidential candidate Mitt Romney and his wife Ann wave to supporters at his Super Tuesday campaign rally in Boston, Massachusetts, March 6, 2012. (AP)

Republican presidential candidate Rick Santorum speaks at his election night rally at Steubenville High School, in Ohio, March 6, 2012. (AP)

Republican presidential candidate Newt Gingrich, left, and his wife Callista wave as they arrive for a Super Tuesday rally in Atlanta, Georgia, March 6, 2012. (AP)

Republican presidential candidate Ron Paul addresses a crowd during the North Dakota caucus in Fargo, March 6, 2012. (AP)

Mary Lou Andrews fills out a voter certification card at Medlock Bridge Elementary School in Johns Creek, Georgia, to vote in the Republican primary, on March 6, 2012. (AP)

A voter looks over her ballot to place her vote at a polling station in Steubenville, Ohio, March 6, 2012. (Reuters)

Marianne DuBois casts her ballot for the Republican presidential primary in Steubenville, Ohio, March 6, 2012. (AP)

Republican presidential candidate Mitt Romney, and his wife Ann, talk to reporters on his campaign plane before taking off for Boston, in Columbus, Ohio, March 6, 2012. (AP)

Republican presidential candidate Rick Santorum leaves the stage after speaking before the American Israel Public Affairs Committee (AIPAC), in Washington, March 6, 2012. (AP)

Republican presidential candidate Newt Gingrich speaks at the U.S. Space and Rocket Center, on March 6, 2012, in Huntsville, Alabama. (AP)

Bob Belew, a coach at Sylvan Park Elementary School in Nashville, Tennessee, welcomes students and voters at a polling place at the school, March 6, 2012. (AP)

Carol Paul, wife of Republican presidential candidate Rep. Ron Paul, R-Texas, fixes his hair before the North Dakota caucus, Tuesday, March 6, 2012 in Fargo, N.D. (AP Photo/Charles Rex Arbogast)

A voter casts his ballot for the Republican presidential primary in Montpelier, Vermont, March 6, 2012. (AP)