human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Poll Source, Dates administered, Democrat: Jill Long Thompson, Republican: Mitch Daniels, Lead Margin
###Question: What is the lowest Lead Margin when Republican: Mitch Daniels was polling at 48%?
gpt
SELECT MIN Lead Margin FROM table WHERE Republican: Mitch Daniels = 48%