I think it'll be 55 voting "Guilty". It'll be the entire Donkey Party caucus with five GOP turncoats -- Collins, Murkowski, Romney, Sasse and Toomey.
EDIT: 57-43. There were seven GOP turncoats (Burr, Cassidy, Collins, Murkowski, Romney, Sasse, Toomey). Burr and Toomey are retiring. Spineless.
Romney the only guilty vote