What party did the incumbent from the Illinois 12 district belong to? 
CREATE TABLE table_1341707_15 (party VARCHAR, district VARCHAR)
SELECT party FROM table_1341707_15 WHERE district = "Illinois 12"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_1341707_15 (party VARCHAR, district VARCHAR) Question: What party did the incumbent from the Illinois 12 district belong to?  [/INST] SELECT party FROM table_1341707_15 WHERE district = "Illinois 12" </s>