legislation_cosponsors: 106-s-1564, C001035

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-s-1564	C001035	Sen. Collins, Susan M. [R-ME]	R	ME	1999-08-05	1