Not surprising, for a couple of reasons. He's voted against Trump on some pretty big issues, he's struggling as an incumbent, and he's a lukewarm conservative at best. Instead they're throwing money at an Hispanic woman in Florida running against Shalala.
When I lived in Bailey Coffman was my representative and he was very conservative. For some reason he's really moved away from that mindset. Don't get me wrong...he's still far, far better than anyone the democrats would run. It appears they're trying to spend money on a better bet since Coffman is approaching double-digits down in his race and Salazar is up a couple of points in her seat...once thought to be a democrat sure-thing in terms of flipping it.