After the speaking portion of the rally, an unpermitted march took off through the nearby 16th Street Mall. As the video below begins, a DPD officer has stopped someone on a bycicle, and appears to be starting to write him a ticket. The crowd comes around, and starts doing various chants in support. If you listen closely, you'll hear a part of the crowd away from the camera chant that "We are Fighting for your Pensions", or something close to that. Just after that, an officer who looks like he's a sergeant with more seniority goes over to the officer writing the ticket and appears to convince him not to write it. Maybe the senior officer is also the union rep? Or maybe he's just a bit closer to pension age.
This struggle is the 99% against the richest 1%. No police officer on a public payroll is ever going to be a part of the richest 1%. The officers of DPD have been wonderful to the OccupyDenver movement so far. Its just a wild guess on my part, but I'm thinking since they are members of a public employees union when cities are cutting back that they don't need any reminding that they are with us in the 99% side of that struggle.