legislation_cosponsors: 109-sres-261, R000146

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
109-sres-261	R000146	Sen. Reid, Harry [D-NV]	D	NV	2005-09-29	1