legislation_cosponsors: 119-hres-1073, C001059

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-hres-1073	C001059	Rep. Costa, Jim [D-CA-21]	D	CA	2026-02-23	1