legislation_cosponsors: 113-sres-562, L000550

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
113-sres-562	L000550	Sen. Landrieu, Mary L. [D-LA]	D	LA	2014-09-18	1