user: Question: Who sponsored the bill introduced on June 9, 2011?
Columns: ['Congress', 'Bill number(s)', 'Date introduced', 'Sponsor(s)', '# of cosponsors', 'Latest status']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['112th Congress', 'S. 1171', 'June 9, 2011', 'Sen. Charles E. Schumer (D-NY)', 19.0, 'Referred to the Senate Committee on Finance']
SQL:

assistant: SELECT "Sponsor(s)" FROM "Table" WHERE "Date introduced" = 'June 9, 2011';