Three of the four major Republican presidential candidates are on track to claim at least one win in today’s 10-state voting. But one candidate, Mitt Romney, has the potential to emerge from the Super Tuesday balloting having transformed from a front-runner into the presumptive leader. The potential for Mr. Romney to enlarge his lead is throwing the spotlight on Ohio and Tennessee. If he takes both, he will have won the nation’s two biggest presidential swing states—Florida and Ohio—and shored up his standing in the South, where the latest Wall Street Journal/NBC News poll shows him drawing new support from a region of the country where his support had been particularly weak.
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