legislation_cosponsors: 112-sres-612, R000361

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-612	R000361	Sen. Rockefeller, John D., IV [D-WV]	D	WV	2012-12-10	1