Added handling of sponsors in rollcalls.
Added handling of sponsors in rollcalls.


Former-commit-id: f636e7a4c2e3627aff1afa33aeff4db4e1de61ef
JeffreyBLewis/WebVoteView,JeffreyBLewis/WebVoteView,JeffreyBLewis/WebVoteView,JeffreyBLewis/WebVoteView