legislation_cosponsors: 109-s-1, H001028

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-1	H001028	Sen. Hagel, Chuck [R-NE]	R	NE	2006-12-08	1