Given his assurance of caucusing with the majority party, this race matters much less now unless Democrats manage to pick up three of AK, CO, IA, NC. It looks like Orman will be a Republican soon.
You act as if this is extremely unlikely.
For Democrats to win three of those? It is. Begich and Braley are clearly losing, Udall is a 50/50 shot at best, and only Hagan is ahead.
Anyway, I strongly encourage Democrats not to run candidates in half of the Senate seats up next year. It will simplify the Republican path to keeping a majority.