If the midterm election a year from now follows tradition and is a referendum on the president, then there are cautionary signs for Democrats in this Las Vegas suburb filled with strip malls, casino workers and retirees that sprawls into the desert.

Narrowly divided suburban districts are expected to play a crucial role in the midterms, contests that traditionally favor the party that doesn’t control the White House. Nevada’s 3rd District encapsulates the headwinds faced by the party that now runs Washington.

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