It looks like, on first alignment, Sanders, Buttigieg, Warren, Biden and Klobuchar are all viable.

Klobuchar’s supporters celebrated when a woman who was standing in the middle of the room went the senator’s way, giving her 39 - the exact viability number. https://t.co/ZpgI38Jdmf

— Dan Merica (@merica) February 4, 2020