Harris' best path is through the 'Blue Wall'
It is increasingly looking like Harris' best -- and perhaps only -- path to 270 electoral votes is by winning the three "Blue Wall" states: Wisconsin, Michigan and Pennsylvania. These states are so named because they voted for Democrats in every presidential election from 1992 to 2012, helping give Democrats a bulwark in the Electoral College. But Trump flipped them in 2016, and ever since, they have been near-essential for Democrats in order to win.
Going into Election Day, surveys indicated that, among the seven main swing states, Harris was polling the best in these three states. She would have liked to have won some of the Sun Belt states, sure, but the northern battlegrounds were more fertile ground. As things stand right now in those states, more votes have been counted for Trump than for Harris, but late-counted ballots are expected to be more Democratic, so they are probably still her best bet to win.