Per the Denver Post, Michael Bennet* has won reelection. (But that actually started to become clear very early this morning.) As I understand it, to trigger an automatic recount, the margin has to be withing a half-percentage point, which would be just under 4,000 votes, by my tally. Bennet currently leads by about 7,500 votes, with the bulk of outstanding votes expected from liberal Boulder County. So that margin should widen. I don't know about provisional/absentee ballots that might still need to be counted, but that's an awfully large gap to overcome, I'd imagine.
*Bennet's brother edits The Atlantic