Seeing the group, which has been estimated to be roughly 8,000-10,000 people, Paul Ryan grew visibly emotional saying, "thank you, Wisconsin! It is good to be home."
The crowd returned the sentiment, cheering wildly as Ryan declared: "We want to elect men and women who run for office and tell us who they really are, what they really believe, what they're really going to do, and then when they get elected, they do that! That's what we do here in Wisconsin!"
Watch the full speech, via Fox News, below:
The Los Angeles Times described the crowd:
The faded [Ryan for Congress] shirt was more than a decade old. Hilbig, a retired psychotherapist from Beloit, said he got it while working on Ryan's first congressional campaign."He's my guy," Hilbig said. "He's an all-American young man. He's an Eagle Scout."
"Let's be honest," his friend Russell Rucker added. "I'm in love with Ryan."
The pair said they were thrilled when Romney announced Ryan as his running mate, because aspects of the former Massachusetts governor's record had given them pause. "We'd just like him to be a tad more conservative," Hilbig said.
But they said Romney's pick of Ryan assuaged those concerns. Together, Hilbig said, the two were a perfect ticket.
"They're an incredible duo," he said.
Chris Sekula, 39, called Romney and Ryan "the team to change America."
"They're going to undo everything that Obama knotted," he said.
Other notable moments out of Wisconsin included a heckler being drowned out by a strong "USA, USA" chant.
Watch a clip of the event, also via Fox News:
Mitt Romney scolded the heckler as the cheers died down: "You see young man, this group right here is respectful of other people's rights to be heard, and you ought to find yourself another place to be disruptive because here we believe in listening to people with dignity and respect."
He continued as the crowd began cheering again: "Mr. President, take your campaign out of the gutter. Let's talk about the real issues that America faces."