legislation_cosponsors: 99-sres-304, S000064

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
99-sres-304	S000064	Sen. Sarbanes, Paul S. [D-MD]	D	MD	1986-01-29	1