legislation_cosponsors: 112-sres-599, F000062

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-599	F000062	Sen. Feinstein, Dianne [D-CA]	D	CA	2012-11-15	1