The so-called blue wall states — Michigan, Wisconsin and Pennsylvania — had gone to the Democrats in every presidential election since the 1990s until President Donald Trump carried them all in 2016. The three states could again prove decisive as Trump tries to hold on to the White House.
Early vote totals in Michigan and Pennsylvania show the president ahead, while Joe Biden edged into a narrow lead in Wisconsin on Wednesday morning.
But the numbers were incomplete and did not include some of the largest and most heavily Democratic areas in the states.