After a brief Google search. It does appear that in Colorado you might have a case regarding mall owners from stopping nonviolent political free speech.

There is some info here:

Law of the Mall
telephone Reviewed by telephone on . Draconia Tactics at The Aurora Mall It seems like things are just falling apart. I just got a phone call from my son (28 years old) and he was well beyond angry. This is the general jist of the story. My son and his girl friend(also 28) were out spending some money after recieving their income tax return and went to the Aurora Mall. This proved not to be a wise choice. My son was detained by several mall personnel for the unlikely crime of wearing a "Yes We Cannibis" tee shirt. I understand that my son can become loud Rating: 5