legislation_cosponsors: 110-s-3493, B000711

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
110-s-3493	B000711	Sen. Boxer, Barbara [D-CA]	D	CA	2008-09-16	1