legislation_cosponsors: 110-hr-3069, 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
110-hr-3069	C001059	Rep. Costa, Jim [D-CA-20]	D	CA	2007-07-17	1