legislation_cosponsors: 99-sres-431, B000401

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
99-sres-431	B000401	Sen. Bentsen, Lloyd M. [D-TX]	D	TX	1986-06-26	0