legislation_cosponsors: 106-sres-48, L000123

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
106-sres-48	L000123	Sen. Lautenberg, Frank R. [D-NJ]	D	NJ	1999-03-02	0