legislation_cosponsors: 111-sres-658, P000590

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
111-sres-658	P000590	Sen. Pryor, Mark L. [D-AR]	D	AR	2010-09-28	1