legislation_cosponsors: 100-hconres-258, M000206

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
100-hconres-258	M000206	Rep. Martinez, Matthew G. [D-CA-30]	D	CA	1988-09-15	0