how many candidates with result being retired to run for u. s. senate republican hold
CREATE TABLE table_1341586_19 (
    candidates VARCHAR,
    result VARCHAR
)
SELECT COUNT(candidates) FROM table_1341586_19 WHERE result = "Retired to run for U. S. Senate Republican hold"
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 with result being retired to run for u. s. senate republican hold ### Input: CREATE TABLE table_1341586_19 (
    candidates VARCHAR,
    result VARCHAR
) ### Response: SELECT COUNT(candidates) FROM table_1341586_19 WHERE result = "Retired to run for U. S. Senate Republican hold"