human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Poll Source, Sample Size, Margin of Error, Date, Democrat, Republican
###Question: What is the sample size of the poll taken on Dec 13-15, 2007 that had a margin of error of more than 4 and resulted with Republican Mike Huckabee?
gpt
SELECT AVG Sample Size FROM table WHERE Republican = mike huckabee AND Margin of Error > 4 AND Date = dec 13-15, 2007