legislation_cosponsors: 99-hres-564, M000249

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-hres-564	M000249	Rep. Matsui, Robert T. [D-CA-3]	D	CA	1986-09-25	1