CREATE TABLE table_2215 ("Poll source" CLOB, "Dates administered" CLOB, "Tom Emmer  ( R ) " CLOB, "Matt Entenza  ( DFL ) " CLOB, "Tom Horner  ( I ) " CLOB, "Undecided" CLOB, "Sampling error" CLOB)

When did Minnesota Poll administer their poll?
SELECT "Dates administered" FROM table_2215 WHERE "Poll source" = 'Minnesota Poll'
SELECT "Dates administered" FROM "table_2215" WHERE "Poll source" = 'Minnesota Poll'