Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_20683381_2 (conductor VARCHAR, undecided VARCHAR, sample_size VARCHAR)
### Question:
Who conducted the poll with sample size of 2000 that shows 18% undecided?
### Answer:
SELECT conductor FROM table_20683381_2 WHERE undecided = "18%" AND sample_size = 2000