CREATE TABLE table_50754 ("Poll source" TEXT, "Date ( s )  administered" TEXT, "Sample size" FLOAT, "Margin of error" TEXT, "Joe Sestak  ( D ) " TEXT, "Pat Toomey  ( R ) " TEXT, "Other" TEXT, "Undecided" TEXT)

WHAT DATE DID JOE SESTAK HAVE 46% WITH 3.0% MARGIN OF ERROR?
SELECT "Date(s) administered" FROM table_50754 WHERE "Joe Sestak (D)" = '46%' AND "Margin of error" = '± 3.0%'
SELECT "Date(s) administered" FROM "table_50754" WHERE "Joe Sestak (D)" = '46%' AND "Margin of error" = '± 3.0%'