legislation_cosponsors: 115-sres-328, C000127

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-sres-328	C000127	Sen. Cantwell, Maria [D-WA]	D	WA	2017-11-09	1