"At a campaign stop in Concord, N.H. on Thursday, GOP presidential candidate Rick Santorum spent more than an hour sparring with college students over everything from gay rights to pot, though he struggled to explain why he won't support states' rights to allow medical marijuana.

When questioned by a student wondering why conservatives tend to favor states' rights except in the case of medical marijuana, Santorum confessed that he does not know his medical cannabis laws." Huffington Post January 2012

This may have simply been an opportunity for Santorum to avoid the issue. 

With a firm hold on the conservative base, Santorum will likely be asked the question about support State's rights. We hope.

According to FINDTheData.org, Santorum does not support the legalization of Medical Marijuana.

Here, Santorum admits to Piers Morgan that he smoked marijuana in college.