legislation_cosponsors: 114-sconres-20, A000360

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
114-sconres-20	A000360	Sen. Alexander, Lamar [R-TN]	R	TN	2015-07-28	1