On what date did congressman joseph tydings enter take his seat?
CREATE TABLE table_26820 (
    "Rank" real,
    "Senator" text,
    "Date of birth" text,
    "Entered Senate" text,
    "Left Senate" text,
    "State served" text,
    "Party" text,
    "Time since entry" text
)
SELECT "Entered Senate" FROM table_26820 WHERE "Senator" = 'Joseph Tydings'
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: On what date did congressman joseph tydings enter take his seat? ### Input: CREATE TABLE table_26820 (
    "Rank" real,
    "Senator" text,
    "Date of birth" text,
    "Entered Senate" text,
    "Left Senate" text,
    "State served" text,
    "Party" text,
    "Time since entry" text
) ### Response: SELECT "Entered Senate" FROM table_26820 WHERE "Senator" = 'Joseph Tydings'