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The Colorado U.S. Senate Democratic primary is Tuesday's marquee contest. Also notable: Former Gov. Jon Huntsman is looking to make a comeback in Utah.
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Russia's Federal Security Service says it arrested Paul Whelan last week. Family members say he was visiting Moscow to attend a wedding, not to steal secrets.
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Responding to reports of Huntsman's selection, the Kremlin says it would welcome any U.S. ambassador who wants to create a dialogue with Russia.