Those Colorado Democrats who have taken sides in the Bennet/Romanoff contest for the Senate seat largely have not done so based on the candidates' policy stances. You'd need an electron microscope to identify the ideological differences between these candidates. Those who are with Romanoff feel that he has paid his dues to the party and has earned a shot at the Senate seat, and that his campaign experience makes him a solid contender against the Republicans. Those who are with Bennet feel that, however he got his job, he's doing it well and deserves to keep it. At least at this point, it's hard to imagine either side failing to embrace the eventual nominee.
Bennet's comments on CNN yesterday that he is willing to lose his job in the fight for health reform were a nice touch and will only help in this regard. In the reasonably likely scenario that Romanoff goes down in next year's primary, his supporters will find much solace in those comments.