Vice President Kamala Harris has razor-thin leads over former President Donald Trump in Michigan, Wisconsin and Pennsylvania, according to a new survey of the so-called “blue wall” states that could win Harris the election if she ekes out victories there.

The state’s closely watched Senate race shows a similarly tight contest, and 93 percent of registered voters say they are certain to vote.

Independent voters are a must-win for both Harris and Trump in the swing states, where polls are currently very close.