legislation_cosponsors: 119-hr-5309, C001080

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
119-hr-5309	C001080	Rep. Chu, Judy [D-CA-28]	D	CA	2025-10-06	0