Biden's rise in 2020 race catches Trump's eye, unnerves his allies

Biden soared from "will-he-or-won't-he-run?" status to the head of the crowded Democratic field just days after announcing his candidacy last week, pulling away from Senator Bernie Sanders and a host of other rivals in opinion polls. A CNN poll gave Biden a 15-point lead in a field of 20 Democratic candidates. Some Trump advisers see the former vice president, with his mainstream blue-collar appeal, as a tough opponent in the three states that carried Trump to his improbable victory in 2016 - Michigan, Wisconsin and Pennsylvania.

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