legislation_cosponsors: 111-sres-174, R000307

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-sres-174	R000307	Sen. Roberts, Pat [R-KS]	R	KS	2009-06-09	1