Stanford merely is enforcing an access policy to their dorms. That's reasonable, isn't it?
Not when those dorms are generally open to access by all students.
Actually, they don't have open access. If you read the article, it mentions how they couldn't get into a dorm because no one would let them in.
Unless there is an issue of selective enforcement, I think the paper's wrong here. This is a policy voted on by the students and as such (should) reflect popular view
But they are restricting access to everyone soliciting or distributing materials. It is not speech specific.