What is the date that the polls were going on at quinnipiac when john mccain was the republican, barack obama was the democrat and the sample size was bigger than 1427?
CREATE TABLE table_44627 (
    "Poll Source" text,
    "Sample Size" real,
    "Margin of Error" real,
    "Date" text,
    "Democrat" text,
    "Republican" text
)
SELECT "Date" FROM table_44627 WHERE "Republican" = 'john mccain' AND "Poll Source" = 'quinnipiac' AND "Democrat" = 'barack obama' AND "Sample Size" > '1427'
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: What is the date that the polls were going on at quinnipiac when john mccain was the republican, barack obama was the democrat and the sample size was bigger than 1427? ### Input: CREATE TABLE table_44627 (
    "Poll Source" text,
    "Sample Size" real,
    "Margin of Error" real,
    "Date" text,
    "Democrat" text,
    "Republican" text
) ### Response: SELECT "Date" FROM table_44627 WHERE "Republican" = 'john mccain' AND "Poll Source" = 'quinnipiac' AND "Democrat" = 'barack obama' AND "Sample Size" > '1427'