Scott Colom, left, and Cindy Hyde-Smith, right.
Getty Images & Mississippi Free Press/AP
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An unpopular president, a charismatic Democratic candidate and an incumbent who has underperformed other Republicans in recent elections have turned a US Senate race in Mississippi into the nail-biter of the midterms.

As of Wednesday afternoon, Democrat Scott Colom was just a few dozen votes ahead of Sen. Cindy Hyde-Smith in a contest that remains too close to call but underscores the midterms’ seismic shift toward Democrats, even in deep-red territory.