legislation_cosponsors: 119-hr-5658, D000623

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-5658	D000623	Rep. DeSaulnier, Mark [D-CA-10]	D	CA	2025-09-30	1