legislation_cosponsors: 111-hres-320, B001251

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-hres-320	B001251	Rep. Butterfield, G. K. [D-NC-1]	D	NC	2009-04-02	1