CREATE TABLE table_50219 ("Date" TEXT, "Opponent#" TEXT, "Rank #" TEXT, "Site" TEXT, "Result" TEXT, "Attendance" TEXT)

What was the rank when the opponent was Wisconsin (played at Wisconsin)?
SELECT "Rank #" FROM table_50219 WHERE "Opponent#" = 'at wisconsin'
SELECT "Rank #" FROM "table_50219" WHERE "Opponent#" = 'at wisconsin'