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By Ginger Gibson and Alana Wise INDIANAPOLIS, Ind. (Reuters) - Republican front-runner Donald Trump scored an important victory over rival Ted Cruz in Indiana on Tuesday, a win that moves him close to being unstoppable in his march to the party's presidential nomination. Trump was on track to take well over 50 percent of the vote, eclipsing Cruz, a U.S. senator from Texas. Ohio Governor John Kasich was running a distant third.