CREATE TABLE table_63159 ("Source" CLOB, "Date" CLOB, "Jody Wagner" CLOB, "Pat Edmonson" CLOB, "Michael Signer" CLOB, "Rich Savage" CLOB, "Jon Bowerbank" CLOB, "Undecided" CLOB)

On which date did Michael Signer earn 4%?
SELECT "Date" FROM table_63159 WHERE "Michael Signer" = '4%'
SELECT "Date" FROM "table_63159" WHERE "Michael Signer" = '4%'