legislation_cosponsors: 112-sconres-23, T000250

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
112-sconres-23	T000250	Sen. Thune, John [R-SD]	R	SD	2011-06-09	1