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.

In the national poll, Harris and Trump were tied at 47 percent among the 2,437 likely voters polled Sept. 11-16, according to a survey by The New York Times, The Philadelphia Inquirer and Siena College. The margin of error was plus or minus 3 percentage points.