legislation_cosponsors: 99-sres-431, M000811

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-431	M000811	Sen. Mitchell, George J. [D-ME]	D	ME	1986-06-26	0