legislation_cosponsors: 119-hr-5309, B001285

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	B001285	Rep. Brownley, Julia [D-CA-26]	D	CA	2026-03-03	0