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Democratic presidential candidate Joe Biden speaks during a campaign rally in Philadelphia Saturday. Drew Angerer/Getty Images hide caption toggle caption Drew Angerer/Getty Images Democratic presidential candidate Joe Biden speaks during a campaign rally in Philadelphia…

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Sen. Mitt RomneyWillard (Mitt) Mitt RomneySeveral factors have hindered 'next up' presidential candidates in recent years Small Florida county that backed Trump one of two targeted by Russians: reports Foreign Relations senators demand Iran briefing…