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Races in five states will determine which party will take control of Congress after the midterm elections.
In Arizona, Senator Mark Kelly is holding a tight lead over Republican challenger Blake Masters.
In Georgia, Democratic Senator Raphael Warnock and Republican Herschel Walker are neck-and-neck.
Republican J.D. Vance and Democratic Representative Tim Ryan are in a close race for the open Ohio Senate seat.
Pennsylvania Democrat John Fetterman's lead has slipped to a razor-thin margin against Republican Mehmet Oz.
In Nevada, the Senate race between incumbent Democrat Catherine Cortez Masto and Republican Adam Laxalt is locked in a dead heat.