When was the Tennessee 3 district incumbent first elected?
CREATE TABLE table_764 (
    "District" text,
    "Incumbent" text,
    "Party" text,
    "First elected" real,
    "Result" text,
    "Candidates" text
)
SELECT MAX("First elected") FROM table_764 WHERE "District" = 'Tennessee 3'
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: When was the Tennessee 3 district incumbent first elected? ### Input: CREATE TABLE table_764 (
    "District" text,
    "Incumbent" text,
    "Party" text,
    "First elected" real,
    "Result" text,
    "Candidates" text
) ### Response: SELECT MAX("First elected") FROM table_764 WHERE "District" = 'Tennessee 3'