legislation_cosponsors: 115-s-537, H001046

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-s-537	H001046	Sen. Heinrich, Martin [D-NM]	D	NM	2017-09-05	0