Any thoughts on the fact in the event of a tied Senate, Orman would have to be known as the guy who (by appearances) single-handedly throws the Senate to the Democrats if he caucuses with them? That would presumably make for an effective attack ad come the 2020 election and might dissuade him now. Then again, it's tempered by the fact it's six years later (meaning voters might care less and also Orman might willingly make that sacrifice in exchange for supporting the party he presumably wants to).
I've been thinking that Orman's got to have calculated that he's likely to be a one term senator no matter what he chooses. If he caucuses with the Dems, he gets attacked by the Republicans come re-election time in 2020 and probably loses. If he caucuses with the Republicans, he gets attacked as not even a RINO and gets ousted by a real Republican in 2020. If it comes down to 49D-50R and he's got to make a decision, I feel like it's got to be based on whatever he actually believes, since he's not likely to stay for more than one term.