It's easy to get ahold of Cory and his staff.  Bennet is tougher to get in touch with but still easy enough.  Now if you are a big enough moron to think that you are going to show up in Bennets office and demand he repeal Obamacare or else you will throw a publicity stunt to think you won't be arrested for trespassing or conversely throwing a publicity stunt in Gardners office without arrest for trespassing you really don't understand how government works.