legislation_cosponsors: 114-sres-80, K000360

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-sres-80	K000360	Sen. Kirk, Mark Steven [R-IL]	R	IL	2015-02-12	1