user: Question: Who was the sponsor on April 22, 2004?
Columns: ['Congress', 'Bill number', 'Date introduced', 'Sponsor', '# of cosponsors']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['107th Congress', 'H.R. 1343', 'April 3, 2001', 'Rep. John Conyers (D-MI)', 208.0]
SQL:

assistant: SELECT "Sponsor" FROM "Table" WHERE "Date introduced" = 'April 22, 2004';