In swing-state Ohio, support has been swinging in a lot of directions as the Republican presidential primary approaches.
Polls have shown lead changes every month since last fall, and a new statewide poll indicates that about half of likely primary voters still may change their minds by March 6.
The Quinnipiac University poll released Wednesday found Rick Santorum surging past Mitt Romney, last month's poll leader. Before that, it was Newt Gingrich, before him Herman Cain, and before them, Romney in a tight race over Rick Perry.
The stakes are high in Ohio. The state offers 66 delegates, second only to Georgia in the 10-state Super Tuesday voting.
And Ohio's crucial history for Republicans - none has won the White House without carrying Ohio - make it a key test.
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