legislation_cosponsors: 112-sjres-20, L000304

Cosponsors for tracked legislation. Distinguishes original cosponsors (signed on at introduction) from later additions. Linked to congress_members via bioguide_id.

This data as json

bill_id	bioguide_id	full_name	party	state	sponsorship_date	is_original_cosponsor
112-sjres-20	L000304	Sen. Lieberman, Joseph I. [ID-CT]	ID	CT	2011-06-21	1