legislation_cosponsors: 113-hr-4258, C001059

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
113-hr-4258	C001059	Rep. Costa, Jim [D-CA-16]	D	CA	2014-03-14	1