legislation_cosponsors: 109-s-2378, M000303

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-s-2378	M000303	Sen. McCain, John [R-AZ]	R	AZ	2006-03-07	1