How many candidates ran in the election where Mike Doyle was the incumbent?
CREATE TABLE table_1341453_40 (
    candidates VARCHAR,
    incumbent VARCHAR
)
SELECT COUNT(candidates) FROM table_1341453_40 WHERE incumbent = "Mike Doyle"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many candidates ran in the election where Mike Doyle was the incumbent? ### Input: CREATE TABLE table_1341453_40 (
    candidates VARCHAR,
    incumbent VARCHAR
) ### Response: SELECT COUNT(candidates) FROM table_1341453_40 WHERE incumbent = "Mike Doyle"