What's the percentage of undecided according to the poll source with sampling error of 2.7%?
CREATE TABLE table_20032301_3 (
    undecided VARCHAR,
    sampling_error VARCHAR
)
SELECT undecided FROM table_20032301_3 WHERE sampling_error = "2.7%"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What's the percentage of undecided according to the poll source with sampling error of 2.7%? ### Input: CREATE TABLE table_20032301_3 (
    undecided VARCHAR,
    sampling_error VARCHAR
) ### Response: SELECT undecided FROM table_20032301_3 WHERE sampling_error = "2.7%"