He spoke to several hundred people -- trying to convince voters to carry his primary win into the state caucuses next weekend.
He came to Springfield after campaign stops in Kansas where he won that state's 40 delegates.
Santorum told an enthusiastic crowd that Missouri gave him a huge boost in the non-binding primary. He used this rally to further explain fundamental differences between himself and GOP front runner Mitt Romney.
"And so when Obamacare came up, I stood for the private sector. Where was Mitt Romney?" Santorum asked.
Santorum attracted a large crowd of evangelicals who say his faith is a big factor in why they support the former senator.
"Because I like his views, his morals. I think he's a good man," says supporter Mary Woods.
Bryan Saunders says, "I think Rick Santorum is more in line with my conservative values. I'm very conservative."
"He was the only one who seemed real to me," says supporter Mackenzie Witt. "He seems like a people person and I think that's what America needs."
"You go out and vote for your values," Santorum told the crowd.
Despite his primary win many experts believe Mitt Romney will win Missouri's delegates through the caucus process. Political Science Professor Brian Calfano says that's one of many reasons Santorum is paying Missouri a visit.
"It's never a guarantee," Calfano says. "Although Romney is probably going to win, there's always the opportunity to try and influence some of the delegates."
"I wanted to come back and say thank you. But as you know, the job is not done," Santorum says.
From Springfield Santorum headed to Cape Giradeau and then to Mississippi, a state where the governor has already endorsed Mitt Romney. But with the Missouri caucuses coming up next weekend, Rick Santorum says he will be back in Missouri again before that time.