Conversation so far:
what was bernie Sanders' position on legislation?
Bernie Sanders was known as a legislator who advocated for progressive causes but rarely forged actual legislation or left a significant imprint on it
what did Bernie Sanders accomplish?
Bernie Sanders voted against the Brady Bill, which mandated federal background checks when buying guns and imposed a waiting period. The bill passed by a vote of 238–187
what did Bernie Sanders vote for instead?
Bernie Sanders voted against the bill four more times in the 1990s

Question: what was his best accomplishment?
Self-contained rewrite: what was Bernie Sander's best accomplishment?