legislation_cosponsors: 119-hr-2021, E000301

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-hr-2021	E000301	Rep. Elfreth, Sarah [D-MD-3]	D	MD	2025-10-17	0