legislation_cosponsors: 119-s-1957, D000563

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-1957	D000563	Sen. Durbin, Richard J. [D-IL]	D	IL	2025-06-04	1