How many candidates were there when Henry Garland Dupré was the incumbent? 
CREATE TABLE table_1342451_16 (candidates VARCHAR, incumbent VARCHAR)
SELECT COUNT(candidates) FROM table_1342451_16 WHERE incumbent = "Henry Garland Dupré"
### Context: CREATE TABLE table_1342451_16 (candidates VARCHAR, incumbent VARCHAR) ### Question: How many candidates were there when Henry Garland Dupré was the incumbent?  ### Answer: SELECT COUNT(candidates) FROM table_1342451_16 WHERE incumbent = "Henry Garland Dupré"