legislation_cosponsors: 119-s-3959, W000817

Cosponsors for tracked legislation. Distinguishes original cosponsors (signed on at introduction) from later additions. Linked to congress_members via bioguide_id.

Data license: Public Domain (U.S. Government data) · Data source: Federal Register API & Regulations.gov API

This data as json

bill_id	bioguide_id	full_name	party	state	sponsorship_date	is_original_cosponsor
119-s-3959	W000817	Sen. Warren, Elizabeth [D-MA]	D	MA	2026-03-02	1