legislation_cosponsors: 97-hres-173, L000090

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
97-hres-173	L000090	Rep. Lantos, Tom [D-CA-11]	D	CA	1981-07-14	1