legislation_cosponsors: 106-sres-59, B001210

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-59	B001210	Sen. Byrd, Robert C. [D-WV]	D	WV	1999-05-05	0