legislation_cosponsors: 119-s-2358, G000386

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-s-2358	G000386	Sen. Grassley, Chuck [R-IA]	R	IA	2025-07-21	1