Republican presidential candidate Rick Santorum said he is concerned about legalized gay marriage spilling over into lessons in the classroom, during a campaign stop in Cedar Falls, IA on Friday.

The former senator from Pennsylvania said when same sex marriages were legally accepted - Iowa legalized gay marriage in 2009 - gay relationships would also be taught about in schools in ways parents against homosexuality wouldn't want their children exposed to.

It could be when students read about their families or when health classes talked about sexuality, he said.

"One of the impacts of same sex marriage is the normalization and inoculation of normalization of same-sex values," he said.