It's been years since Wisconsin has gotten his much attention amid a presidential race, but polls show the state is divided and its 10 Electoral College votes could be critical to winning the White House.
The state has been through a lot in the last few years, with the recalls and the selection of U.S. Rep. Paul Ryan as Mitt Romney's running mate.
On Saturday, the GOP brought in some muscle to the state to try to fire up the base -- but the Obama campaign had their own star-studded event in Milwaukee as pop star Katy Perry joined a rally.
In Hudson, former Gov. Tommy Thompson, now 70, held an event as he seeks a seat in the U.S. Senate -- but he wasn't alone. Former New York City Mayor Rudy Giuliani joined him on stage to blast President Barack Obama for what he called a lack of leadership in the aftermath of superstorm Sandy.
"There are people that haven't been in their homes for four or five days. They don't have water in New York. His FEMA didn't think to preposition water for New York," Giuliani said.
Thompson's challenger, Democratic Rep. Tammy Baldwin is putting up quite a fight as well.
"What Tommy's not telling you is what he's been up to since he left the state of Wisconsin -- 'cause you know he went to work in Washington for George W. Bush and helped turn Bill Clinton's surplus into a deficit," she told supporters.
Minnesota's former Senator Norm Coleman also crossed the border to St. Croix in an effort to remind Republican supporters that the badger state's 10 electoral votes will count on Tuesday.
"We are in the center of the political universe," he told the crowd. "Mitt Romney is going to become President of the United States because he is going to win Wisconsin."
Yet, while the Republicans were trying to rally the base in the north for Romney, Obama wasn't going to give up an inch of ground in the state.
"Wisconsin, we are all gathered here today because we got more work to do. As long as there is a single American who wants a job but can't find one, our work is not yet done," Obama said.
The Real Clear Politics polls show Obama has about a five-point lead in Wisconsin heading into Election Day.