legislation_cosponsors: 112-s-1770, B001265

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-s-1770	B001265	Sen. Begich, Mark [D-AK]	D	AK	2012-03-13	0