legislation_cosponsors: 115-hr-4547, L000578

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-4547	L000578	Rep. LaMalfa, Doug [R-CA-1]	R	CA	2018-01-17	0