legislation_cosponsors: 100-sjres-40, L000123

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
100-sjres-40	L000123	Sen. Lautenberg, Frank R. [D-NJ]	D	NJ	1987-05-20	0