legislation_cosponsors: 103-s-578, K000017

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
103-s-578	K000017	Sen. Kassebaum, Nancy Landon [R-KS]	R	KS	1993-03-11	1