Question: How many candidates won the election of John N. Sandlin?
SQL: SELECT COUNT("Candidates") FROM "1-1342426-18" WHERE "Incumbent" = 'John N. Sandlin';

Question: Who was the incumbent in the election of Henry Garland Dupré (D) Unopposed?
SQL: SELECT "Incumbent" FROM "1-1342426-18" WHERE "Candidates" = 'Henry Garland Dupré (D) Unopposed';