legislation_cosponsors: 111-hconres-290, B001231

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
111-hconres-290	B001231	Rep. Berkley, Shelley [D-NV-1]	D	NV	2010-06-24	1