legislation_cosponsors: 99-hconres-406, S000409

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-hconres-406	S000409	Rep. Siljander, Mark D. [R-MI-4]	R	MI	1986-10-09	1