Former Pennsylvania senator Rick Santorum will return to Iowa this month to speak to GOP groups — and to stoke buzz about his possible presidential candidacy in 2012. “I’m looking forward to returning,” he says. “Each time I visit the Hawkeye state, I am struck by how concerned Iowans are about the state of our nation. They are fired up about the midterm elections.” This will be Santorum’s fourth trip to the land of the first caucus.