legislation_cosponsors: 112-sres-582, R000595

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-582	R000595	Sen. Rubio, Marco [R-FL]	R	FL	2012-09-22	0