Which Poll source has an Arlen Specter* of , and a Tom Ridge* of 60%?
CREATE TABLE table_76371 (
    "Poll source" text,
    "Dates administered" text,
    "Arlen Specter*" text,
    "Pat Toomey" text,
    "Tom Ridge*" text,
    "Peg Luksik" text
)
SELECT "Poll source" FROM table_76371 WHERE "Arlen Specter*" = '––' AND "Tom Ridge*" = '60%'
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: Which Poll source has an Arlen Specter* of , and a Tom Ridge* of 60%? ### Input: CREATE TABLE table_76371 (
    "Poll source" text,
    "Dates administered" text,
    "Arlen Specter*" text,
    "Pat Toomey" text,
    "Tom Ridge*" text,
    "Peg Luksik" text
) ### Response: SELECT "Poll source" FROM table_76371 WHERE "Arlen Specter*" = '––' AND "Tom Ridge*" = '60%'