legislation_cosponsors: 119-hr-5151, C001117

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-5151	C001117	Rep. Casten, Sean [D-IL-6]	D	IL	2025-09-04	1