CREATE TABLE table_2213 ("Poll source" CLOB, "Dates administered" CLOB, "Tom Emmer  ( R ) " CLOB, "Matt Entenza  ( DFL ) " CLOB, "Tom Horner  ( I ) " CLOB, "Undecided" CLOB, "Sampling error" CLOB)

What percentage voted for Tom Horner according to the poll source with sampling error of 2.5%?
SELECT "Tom Horner (I)" FROM table_2213 WHERE "Sampling error" = '2.5%'
SELECT "Tom Horner (I)" FROM "table_2213" WHERE "Sampling error" = '2.5%'