legislation_cosponsors: 115-sres-156, V000128

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-156	V000128	Sen. Van Hollen, Chris [D-MD]	D	MD	2017-05-04	1