In a Marquette Law School poll released Wednesday (margin of error 4.4 points), which includes undecided voters leaning toward one of the candidates, Harris trails likely voters by 50% to 49% – showing Trump the six- Harris' points lead has narrowed significantly, the school's previous poll from October 2 showed.

Harris has a larger lead of 51% to 45% (margin of error 4.8 points) in a CNN/SSRS poll also released Wednesday.

In a Cooperative Election Study poll released this week, part of a nationwide study of universities conducted by YouGov (1,542 respondents), Harris has a 50% to 47% lead over Trump.

Trump has a slim one-point lead (margin of error 3.4) in an Emerson College poll of likely voters released Thursday, while the candidates are neck and neck in two other polls taken last week: a Quinnipiac poll that has them both one had support at 48% and a Bloomberg/Morning Consult poll shows Trump up 48.3% to 48%.

In a Washington Post-Schar School poll of likely voters released last week, Harris gained three points, 50% to 47% (margin of error 4.6), and a Wall Street Journal poll in early October found her among registered voters is 48%.

Most polls in Wisconsin – whose 10 electoral votes could prove decisive – reflect a razor-thin race, with Harris leading by just 0.3 points in the FiveThirtyEight weighted average.

Voter turnout in Wisconsin could be high in November as the state faces several closely contested U.S. House elections and Republicans wage a tough battle for majority control of the state legislature, said Anthony Chergosky, an assistant professor of political science at the University of Wisconsin-La Crosse told WUWM Public Radio in Milwaukee.

Dwindling support for Democratic Sen. Tammy Baldwin in the Wisconsin Senate race is also seen as a warning sign for Democrats, as Cook Political Report last week turned the state from a lean Democratic state into a contender after finding her lead ahead Republican Eric Hovde has shrunk by seven points to two since August, although a Marquette Law School poll also released last week showed her still with a seven-point lead.

Biden won Wisconsin by less than a point in 2020, flipping the state after Trump defeated Hillary Clinton there in 2016; Former President Barack Obama won the state by significant margins in both 2008 and 2012.