legislation_cosponsors: 115-hres-476, L000580

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
115-hres-476	L000580	Rep. Lujan Grisham, Michelle [D-NM-1]	D	NM	2017-07-26	1