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Presumptive GOP presidential nominee Mitt Romney may be on an overseas trip, but that doesn't mean his campaign isn't going all-in this weekend in Wisconsin.

On Sunday, Wisconsin Republicans U.S. Rep. Paul Ryan and U.S. Sen. Ron Johnson and Republican National Committee Chairman Reince Priebus will be among those aboard the Romney campaign bus on a tour of campaign offices in Waukesha, Green Bay and Janesville.

"We believe that Wisconsin is ripe for (former Massachusetts) Governor Romney and the Republicans to win in November," Priebus said during a telephone interview Friday.

"The reason why we think we have a real shot at Wisconsin is that we've had a real shift in the electorate in the focus on the economy, on spending and on people being true to their word when they're elected to office," he said. "I think Governor Walker, Paul Ryan and Ron Johnson have led the way in this electoral shift."

In the latest Rasmussen Poll, released Friday, President Barack Obama led Romney in Wisconsin by 49% to 46%, falling within the margin of error. The survey of 500 likely voters was conducted Wednesday. In 2008, Obama easily defeated John McCain in Wisconsin, continuing a Democratic presidential winning streak in the state that began in 1988.

Yet Republicans in Wisconsin remain buoyed by Walker's triumph in June's recall election. They say they have built a campaign infrastructure that will carry them through the fall.

This weekend, the Republican National Committee's independent expenditure unit purchased $60,000 worth of television advertising in three Wisconsin markets - Madison, Milwaukee and Green Bay, according to media buyers associated with the Democratic Party. The figure is a tiny fraction of GOP ad buys in battleground states, according to the Democrats.

"The air will be saturated," Priebus said of television campaign advertisements that will air through the autumn. "What will matter is who is better on the ground, who's punching. It's just like football. Which line is bigger, better and who will last longer. That's who will win the game."

Joe Zepecki, communications director of the Obama for America campaign in Wisconsin, said "what is happening this week underscores how much ground Romney and the Republicans have to make up" in the state.

"They're placing shadow ad buys and rallying the faithful," he said. "Our organization has over 1,500 volunteers pounding the pavement, hitting the phones, talking to undecided voters about the clear choice in this election. Nothing that has happened in the last week changes the fact that middle-class voters in Wisconsin understand that President Obama is fighting for them every day, and Mitt Romney's plans would blow a hole in the deficit with more budget-busting tax cuts for the very wealthy while raising taxes on the middle class."

Ryan, mentioned as a potential vice presidential running mate with Romney, said winning Wisconsin in the fall is within reach for the Republicans.

"The recalls show you even after everything that is thrown at us, including the kitchen sink, we can win elections here," Ryan said Friday.

He also said Romney proved his ability to win in Wisconsin by carrying the GOP primary over former Pennsylvania Sen. Rick Santorum.

Ryan said a bus tour in the middle of summer can be used to rally volunteers and build momentum for the fall.

"I think people are energized and excited," he said of Wisconsin's Republicans. "They see we're headed in the right direction in this state and they want to finish the job in November."