legislation_cosponsors: 119-sres-587, B001261

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-587	B001261	Sen. Barrasso, John [R-WY]	R	WY	2026-01-27	1