Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Week | Date | Opponent | Result | Attendance |
| --- | --- | --- | --- | --- |
| 1.0 | September 11, 1966 | Cleveland Browns | L 38-14 | 48,643 |
| 2.0 | September 18, 1966 | at St. Louis Cardinals | L 23-7 | 40,198 |
| 3.0 | September 25, 1966 | at Pittsburgh Steelers | W 33-27 | 37,505 |
| 4.0 | October 2, 1966 | Pittsburgh Steelers | W 24-10 | 47,360 |
| 5.0 | October 9, 1966 | Atlanta Falcons | W 33-20 | 50,116 |
| 6.0 | October 16, 1966 | at New York Giants | L 13-10 | 62,865 |
| 7.0 | October 23, 1966 | St. Louis Cardinals | W 26-20 | 50,154 |
| 8.0 | October 30, 1966 | at Philadelphia Eagles | W 27-13 | 60,658 |
| 9.0 | November 6, 1966 | at Baltimore Colts | L 37-10 | 60,238 |
| 10.0 | November 13, 1966 | Dallas Cowboys | L 31-30 | 50,927 |
| 11.0 | November 20, 1966 | at Cleveland Browns | L 14-3 | 78,466 |
| 12.0 | November 27, 1966 | New York Giants | W 72-41 | 50,439 |
| 13.0 | Bye | Bye | Bye | Bye |
| 14.0 | December 11, 1966 | at Dallas Cowboys | W 34-31 | 64,198 |
| 15.0 | December 18, 1966 | Philadelphia Eagles | L 37-28 | 50,405 |
Question:
Who was the opponent at the game with a result of W 26-20?
Answer:
St. Louis Cardinals