legislation_cosponsors: 114-sres-421, M001169

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
114-sres-421	M001169	Sen. Murphy, Christopher [D-CT]	D	CT	2016-04-13	1