Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_2214 ( "Poll source" text, "Dates administered" text, "Tom Emmer (R)" text, "Matt Entenza (DFL)" text, "Tom Horner (I)" text, "Undecided" text, "Sampling error" text )

### Question ###
What's the percentage of undecided according to the poll source with sampling error of 2.7%?

### Accurate SQL ###

SELECT "Undecided" FROM table_2214 WHERE "Sampling error" = '2.7%'