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Glad-handing, cheesy grins and more political speeches as candidates prepare for another set of GOP primaries on Tuesday

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Former Gov. Mitt Romney greets supporters during a town hall style meeting at Wisconsin Building Supply on April 2, 2012 in Green Bay, Wis. With one day to go before the Wisconsin primary, Mitt Romney is making a final push through the state.

NBC News reports:

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Presidential candidate Rick Santorum reacts while signing a cheese head during a visit to Simon's Specialty Cheese Retail Store in Appleton, Wis.

The Wisconsin GOP primary is still a day away. And, yes, Rick Santorum could always pull off a surprise tomorrow. But it's also hard not to recognize that the general election has already begun. On Friday, Mitt Romney unveiled a new stump speech that focused exclusively on President Obama and not his GOP rivals. Then, on Sunday, Vice President Biden appeared on "Face the Nation," where he unloaded on Romney.

Also late last week, a conservative group with ties to the Koch Brothers launched a $3 million-plus TV ad campaign in battleground states, while the pro-Obama Super PAC is now up with its own response. And yesterday, Senate Minority Leader Mitch McConnell said “the chances are overwhelming that [Romney] will be our nominee. It seems to me we’re in the final phases of wrapping up this nomination.” To be sure, we might see final minor twist or turn in this GOP primary race, but with seven months until Nov. 6, the general-election train appears to have finally left the station.

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Former House Speaker Newt Gingrich waits back stage while his wife, Callista Gingrich, introduces him during a campaign town hall-style meeting at the Hodson Auditorium on the campus of Hood College, April 2, 2012 in Frederick, Maryland. Md. After acknowledging it is impossible for him to win the GOP presidential nomination outright, Gingrich has vowed to stay in the presidential race even after firing a third of his campaign staff last week, taking the fight to the party convention.

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