legislation_cosponsors: 119-sres-623, B001288

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-623	B001288	Sen. Booker, Cory A. [D-NJ]	D	NJ	2026-02-26	1