LAS VEGAS, NEVADA - OCTOBER 22:    U.S. Rep. and U.S. Senate candidate Jacky Rosen (D-NV) listens during a get-out-the-vote rally featuring former U.S. President Barack Obama at the Cox Pavilion as he campaigns for Nevada Democratic candidates on October 22, 2018 in Las Vegas, Nevada. Early voting in Clark County, Nevada began on October 20 and has recorded the highest turnout during the first two days of early voting in a midterm election.  (Photo by Ethan Miller/Getty Images)