legislation_cosponsors: 112-sres-289, M000702

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-289	M000702	Sen. Mikulski, Barbara A. [D-MD]	D	MD	2011-10-06	1