The Republicans remaining silent on virtually everything tell us all we need to know about them. Sorry I am not picking the lesser of two evils. Not a very good strategy. Look where it has led us.
See post 47 of this thread; there is NOTHING the Republicans can do to stop it. They cannot filibuster, and it only takes 34 Democrats to ratify the treaty. There are more than 34 guaranteed-safe Democrat Senate seats, so even raising the hue and cry won't help; you cannot vote out those who would ratify the treaty.