user: Question: What is the party of the politician who left office on January 12, 1857
Columns: ['Name', 'Took office', 'Left office', 'Party', 'Governor']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Christopher Harrison', 'November 7, 1816', 'December 17, 1818', 'Democratic-Republican', 'Jonathan Jennings']
SQL:

assistant: SELECT "Party" FROM "Table" WHERE "Left office" = 'January 12, 1857';