Table:
text: United States House of Representatives elections, 1968
Louisiana
Louisiana
District Incumbent Party First_elected Result_ Candidates
Louisiana 1 F. Edward Hebert Democratic 1940 Re-elected F. Edward Hebert (D) Unopposed
Louisiana 2 Hale Boggs Democratic 1946 Re-elected Hale Boggs (D) 51.2% David C. Treen (R) 48.8%
Louisiana 3 Edwin E. Willis Democratic 1948 Lost renomination Democratic hold Patrick T. Caffery (D) Unopposed
Louisiana 4 Joe Waggonner Democratic 1961 Re-elected Joe Waggonner (D) Unopposed
Louisiana 5 Otto Passman Democratic 1946 Re-elected Otto Passman (D) Unopposed
Louisiana 6 John Rarick Democratic 1966 Re-elected John Rarick (D) 79.3% Loyd J. Rockhold (R) 20.7%
Louisiana 7 Edwin Edwards Democratic 1965 Re-elected Edwin Edwards (D) 84.9% Vance W. Plauche (R) 15.1%

Question: Which district did Joe Waggonner serve in the 1968 United States House of Representatives election in Louisiana?

Question: What is the name of the incumbent who was first elected in the 1940 election to the United States House of Representatives in Louisiana in 1968?