legislation_cosponsors: 119-hr-1817, J000309

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-1817	J000309	Rep. Jackson, Jonathan L. [D-IL-1]	D	IL	2025-03-03	1