legislation_cosponsors: 109-s-4081, L000174

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
109-s-4081	L000174	Sen. Leahy, Patrick J. [D-VT]	D	VT	2006-12-05	1