Although Trump has historically outperformed his Democratic opponents among white and non-college educated voters, the results are a worrying sign for Harris, for whom white women without a college degree could be a crucial demographic, particularly in suburban areas in Michigan, Wisconsin and Pennsylvania.

Who will win the race to the White House? Here are presidential polling averages in seven battleground states as of Oct. 3.

In a speech to Michigan supporters, the vice president touted her record of backing workers and warned that Trump would abandon them.