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Voters in three western U.S. states are headed to the polls Tuesday for presidential nominating contests, with the leading contenders, Republican Donald Trump and Democrat Hillary Clinton, looking to boost their leads in the race to win their parties' nominations. Political surveys indicate Trump appears likely to win in Arizona, over his two remaining rivals, Texas Senator Ted Cruz and Ohio Governor John Kasich. The outcome is in doubt in Utah. Pre-election polls show Cruz in the lead there. In the Democratic contest, the opinion polls show that Clinton is poised to win in Arizona, but is engaged in close contests with Vermont Senator Bernie Sanders, in Utah and Idaho.