legislation_cosponsors: 112-sres-522, M001153

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-sres-522	M001153	Sen. Murkowski, Lisa [R-AK]	R	AK	2012-07-16	1