legislation_cosponsors: 108-sres-412, L000261

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
108-sres-412	L000261	Sen. Levin, Carl [D-MI]	D	MI	2004-07-20	1