legislation_cosponsors: 111-sres-540, K000148

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
111-sres-540	K000148	Sen. Kerry, John F. [D-MA]	D	MA	2010-05-26	1