legislation_cosponsors: 115-hr-2983, G000576

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
115-hr-2983	G000576	Rep. Grothman, Glenn [R-WI-6]	R	WI	2017-12-21	0