IMO, this comes down to Frist.
He has to call the vote next week.
These Senators are trying to avoid going on record. They do not want to explain this to their constituents. Wi or lose he needs to tell them to shove it and make it known where they stand.
Remember, Frist is having that "meeting" or press conference with those black leaders regarding the votes, especially Janice Rogers Brown....tomorrow.
I don't think Frist would want to let a group of conservative black people that are willing to publicly come out and support these nominees down....wouldn't look at all good on a POTUS resume...