legislation_cosponsors: 111-sres-111, B000953

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-111	B000953	Sen. Brownback, Sam [R-KS]	R	KS	2009-05-06	0