Question: Which Democratic US Senator set a record for margin of victory with 71.2% in the 2004 election only to be surpassed by Kirsten Gillibrand's 72% of the vote  in 2012?
{'answer': 'Chuck Schumer', 'supporting_facts': [['United States Senate election in New York, 2004', 0], ['United States Senate election in New York, 2004', 1], ['United States Senate election in New York, 2004', 2], ['Kirsten Gillibrand', 0]]}