legislation_cosponsors: 112-sres-87, U000038

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
112-sres-87	U000038	Sen. Udall, Mark [D-CO]	D	CO	2011-03-17	0