How many candidates were there in the election for William Jennings Bryan Dorn's seat?
CREATE TABLE table_1341897_42 (
    candidates VARCHAR,
    incumbent VARCHAR
)
SELECT COUNT(candidates) FROM table_1341897_42 WHERE incumbent = "William Jennings Bryan Dorn"
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 were there in the election for William Jennings Bryan Dorn's seat? ### Input: CREATE TABLE table_1341897_42 (
    candidates VARCHAR,
    incumbent VARCHAR
) ### Response: SELECT COUNT(candidates) FROM table_1341897_42 WHERE incumbent = "William Jennings Bryan Dorn"