legislation_cosponsors: 119-sres-623, S001208

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	S001208	Sen. Slotkin, Elissa [D-MI]	D	MI	2026-02-26	1