Question: Who's the incumbent of the Louisiana 1 district?
SQL: SELECT "Incumbent" FROM "1-1341604-19" WHERE "District" = 'Louisiana 1';

Question: Who were the candidates in the Louisiana 4 district?
SQL: SELECT "Candidates" FROM "1-1341604-19" WHERE "District" = 'Louisiana 4';

Question: Who's the incumbent in the district first elected in 1976?
SQL: SELECT "Incumbent" FROM "1-1341604-19" WHERE "First elected" = 1976.0;