legislation_cosponsors: 98-sjres-261, M000250

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
98-sjres-261	M000250	Sen. Matsunaga, Spark M. [D-HI]	D	HI	1984-03-20	1