There are many reasons for supporting or not supporting a candidate in a primary race. I could cite many reasons to support either Andrew Romanoff or Michael Bennet -but for Democrats there is really only one thing that they should know about this primary.
It’s that Michael Bennet can’t win against the Republicans.
From the Hill:
Sen. Bennet faces uphill battle if he wins the primary
The troubling news for Bennet — and other Democratic incumbents — is that only 42 percent of the Colorado voters polled approve of him, and 44 percent disapprove. Moreover, asked whether they wanted to elect a new person or reelect their incumbent, just 34 percent would vote for their incumbent, while 55 percent prefer a new person.