Technically, schools, state or not, can implement whatever policies they wish. If you're a student and carry handgun onto campus, you can get expelled. If you're staff/faculty, you can get fired.
Unless there's specific state statute that disallows the carrying of a firearm, a visitor to the college would be lawfully carrying if he entered a college armed. However, there's nothing stopping public safety from asking that person to leave the premises or face a trespassing charge.
As for the best place to get an 'official' answer, check your student handbook. As for getting those rules changed, may want to check with public safety (probably a bad idea) or your Campus Director/Dean of Student Services. I'm thinking it'd be a hard, uphill battle, much like GMU.