Biden says election 'ain't over till every vote is counted'

Biden's hopes for a decisive early defeat of Trump faded as television networks projected the president won in Florida, a must-win state for Trump vital to his chances, and took leads in Georgia, Ohio and Texas.

Biden, 77, was eyeing the so-called "blue wall" states of Michigan, Wisconsin and Pennsylvania that sent Trump, 74, to the White House in 2016 for possible breakthroughs, although vote counting could stretch for hours or days there.

"We feel good about where we are," Biden told supporters in his home state of Delaware, shouting over a din of motorists in a crowd of cars honking their horns in approval. "We believe we're on track to win this election."