legislation_cosponsors: 119-sres-89, R000605

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-sres-89	R000605	Sen. Rounds, Mike [R-SD]	R	SD	2025-02-21	1