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:
| District | Incumbent | Party | First elected | Result | Candidates |
| --- | --- | --- | --- | --- | --- |
| Louisiana 1 | F. Edward Hebert | Democratic | 1940.0 | Re-elected | F. Edward Hebert (D) Unopposed |
| Louisiana 2 | Hale Boggs | Democratic | 1946.0 | Re-elected | Hale Boggs (D) 51.2% David C. Treen (R) 48.8% |
| Louisiana 3 | Edwin E. Willis | Democratic | 1948.0 | Lost renomination Democratic hold | Patrick T. Caffery (D) Unopposed |
| Louisiana 4 | Joe Waggonner | Democratic | 1961.0 | Re-elected | Joe Waggonner (D) Unopposed |
| Louisiana 5 | Otto Passman | Democratic | 1946.0 | Re-elected | Otto Passman (D) Unopposed |
| Louisiana 6 | John Rarick | Democratic | 1966.0 | Re-elected | John Rarick (D) 79.3% Loyd J. Rockhold (R) 20.7% |
| Louisiana 7 | Edwin Edwards | Democratic | 1965.0 | Re-elected | Edwin Edwards (D) 84.9% Vance W. Plauche (R) 15.1% |
Question:
What district did Joe Waggonner belong to?
Answer:
Louisiana 4