I actually hope they vote on this bill and all gun bills including the AWB / magazine capacity on the full floor. That will get them on record. It will never become law anyway (think House) but will "out" those who are trying to have it both ways - then the NRA can go to work on those senators representing states more friendly to the 2A than is Maryland.
Harry Reid knows that hence his previous reluctance to allow a floor vote.
I hope it goes this way. Then folks can get 'Manchined' and learn a hard lesson about treachery.