Andrew Romanoff picked up some pretty big labor endorsements today, the United Food and Commercial Workers and the Colorado Teamsters. These are not trivial endorsements -- they come with election labor, the kind that can flood precinct caucuses and affect primaries. Others would know better than I about the endorsement histories of these unions, but it's rare for such prominent groups to throw their weight behind candidates they don't think can win. I assume they're motivated both by their history with Romanoff and some recent polling suggesting Romanoff might be a stronger candidate in the general election.
The odds are still rather long for Romanoff. Bennet has a huge financial advantage (the president's visit next week will only increase that), and the bulk of major endorsements are currently going Bennet's way. But the odds are somewhat less long than they were a week ago.