Vice President Kamala Harris and former President Donald Trump are in a statistical tie in the Wisconsin battleground, according to the final Marquette University Law School poll released ahead of Election Day.

Among likely voters, 50% support Harris and 49% support Trump. In the latest Marquette poll conducted in late September, Harris had a four point lead between both groups, but still within the margin of error.

“The race has tightened a little bit,” said poll director Charles Franklin. “If I haven’t made it clear before, let me say it again. It shouldn’t surprise anyone if Donald Trump wins and it shouldn’t surprise anyone if Kamala Harris wins.”

The survey was conducted between October 16 and 24. It polled 834 registered voters, of whom 753 are considered likely to vote, based on their 2016 voting record. The margin of error was plus or minus 4.4 percentage points for both registered and likely voters voters.

The Marquette poll is ranked among the best in the country. Other surveys aggregated by RealClearPolling.com show Trump with a slight lead in Wisconsin. In 2020, the Wisconsin election was decided by less than one percentage point. Franklin noted that Marquette’s poll dropped four points that year and six points in 2016.

A USA TODAY/Suffolk University poll of 500 likely voters in Wisconsin last week found Trump at 48 percent and Harris at 47 percent, with a margin of error of 4.4 percentage points.

Both campaigns are frequenting Wisconsin in the final days of the presidential race. Harris will be joined by famous musicians gather college voters at the University of Wisconsin-Madison on Wednesdaywhile Former Green Bay Packers quarterback Brett Favre will join Trump today in Green Bay.

More: Last Minute Campaigning: A Tradition in Wisconsin Presidential Politics

When considering third-party candidates like Jill Stein, Cornel West and Chase Oliver, Harris leads Trump by two points among likely voters. While support dipped in the latest poll for independent candidate Robert F. Kennedy, Jr., he rebounded by as much as 5 percent despite dropping out of the race.

“That 9 percent who say, ‘I’d like to vote for one of these third-party candidates,’ could very easily tip this race one way or the other,” Franklin said.

This article originally appeared on the Milwaukee Journal Sentinel: Harris, Trump in heat in Wisconsin, new Marquette poll says