CREATE TABLE table_1341843_19 (candidates VARCHAR, incumbent VARCHAR)
SELECT candidates FROM table_1341843_19 WHERE incumbent = "Joe Waggonner"
ใครคือผู้สมัครในเขตที่มีผู้ดำรงตำแหน่งคือ Joe Waggonner?
Who were the candidates in the district whose incumbent is Joe Waggonner?