MADISON, Wis. -

With only hours remaining before polls open for Wisconsin's historic recall election, both Republican Gov. Scott Walker and Democratic challenger Tom Barrett stalked the state to solicit last-minute votes.

Tuesday's election is only the third time a U.S. governor has faced recall, and both candidates found a similar message on the campaign trail on Monday: Get out the vote.

The Government Accountability Board predicts voter turnout will be between 60 and 65 percent on Tuesday. This means up to 2.8 million people will cast ballots in the recall race.

Both Walker and Barrett each made six scheduled stops around the state on Monday.

The governor made his first stop at Placon Plastics in Fitchburg, touring the facility and talking to workers. Walker made clear that although he needs high turnout in counties like Waukesha and Washington, he isn't conceding any part of the state to Barrett.

"We're cautiously optimistic," Walker said. "We're not overconfident. We understand that this is going to be a big vote turnout. There's a lot of passion in this state from all directions :We want to make sure we get our voters out and we make any last-minute appeals to undecided votes. That if they want to move on and move forward, we're the candidate."

Walker made a point to say that he always thought the race would be tight despite what any polling that's been conducted.

Walker visited an RV manufacturer in the La Crosse area and a brewery in Stevens Point.

The governor will hold a rally with supporters at Serb Hall in Milwaukee on Monday night.

He is expected to vote at 7 a.m. on Tuesday in Wauwatosa.

Barrett, Milwaukee's mayor who lost to Walker in the 2010 gubernatorial race, said on Monday there are major differences between then and now.

While visiting Portage on Monday, Barrett said that getting people to the polls is key to taking back the governor's office. He fired up a crowd of supporters in the city's downtown with that message, saying all of them need to find one person who didn't vote in 2010 and get them out to the polls on Tuesday.

Barrett said there wasn't much excitement that year, but this time is different.

"It's Venus and Mars. (It's) totally different because there are people this time. Last time, it was dead, it was totally dead in 2010," he said. "And this time, every place we've gone has been totally packed and the energy and excitement has been real."

Barrett said the election is about the middle class reclaiming the future of Wisconsin.

Barrett said that he doesn't mind that President Barack Obama hasn't been to Wisconsin campaigning for him. Instead, he chose to focus on former President Bill Clinton's visit in support last week.

The governor has regularly attacked Barrett for not putting out a budget plan. The mayor said that his plan looks very similar to what he proposed back in 2010, focusing on economic development and leaning up government.

Barrett was headed to Kenosha for a rally on Monday night, which was his fifth stop on the night before polls open.