legislation_cosponsors: 100-hconres-258, D000435

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	D000435	Rep. Dornan, Robert K. [R-CA-38]	R	CA	1988-05-12	0