The main focus of the Dem's 2011 CO gerrymander map (at the federal office level) was to get Coffman out, by  putting more D's than R's in his district.  Fortunately he has (so far) managed to keep winning even though they tried to stack the deck against him.  Regardless of the outcome though, it doesn't mean they didn't stack the deck.  That's what gerrymandering is.  (And yes, both parties do it when and where they're in position to do it.)

That 2011 Dem CO gerrymander was, unfortunately, far more effective at the state legislature level (State House and State Senate).  A recent DP article spoke to that one...

http://www.denverpost.com/2017/06/25/colorado-democrats-benefit-gerrymandering/