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"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_1342451_16 (candidates VARCHAR, incumbent VARCHAR) Question: How many candidates were there when Henry Garland Dupré was the incumbent?  [/INST] SELECT COUNT(candidates) FROM table_1342451_16 WHERE incumbent = "Henry Garland Dupré" </s>