NBC News poll: Newly popular Harris builds momentum, challenging Trump for the mantle of change
IE 11 is not supported. For an optimal experience visit our site on another browser. Now Playing NBC News poll: Newly popular Harris builds momentum, challenging Trump for the mantle of change 04:26 UP NEXT Missouri Democratic Senate Candidate won’t endorse in presidential race 06:38 Springfield, Ohio Mayor: ‘Helpful’ if city left out of debate…