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CARROLLTON, OH - MARCH 06:  Voters cast their ballots at a polling place during Super Tuesday voting on March 6, 2012 in Carrollton, Ohio. The two top Republican presidential candidates Mitt Romney and Rick Santorum are running neck and neck in the state.    (Photo by Mario Tama/Getty Images)
CARROLLTON, OH - MARCH 06:  Voters cast their ballots at a polling place during Super Tuesday voting on March 6, 2012 in Carrollton, Ohio. The two top Republican presidential candidates Mitt Romney and Rick Santorum are running neck and neck in the state.    (Photo by Mario Tama/Getty Images)

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    Independents key on Super Tuesday

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Independents key on Super Tuesday

CNN political analysts look at the big day for U.S. GOP candidates and who may come out on top.

Independents key on Super Tuesday

CNN political analysts look at the big day for U.S. GOP candidates and who may come out on top.