How many categories of first elected are in Washington 4 district? 
CREATE TABLE table_1805191_48 (first_elected VARCHAR, district VARCHAR)
SELECT COUNT(first_elected) FROM table_1805191_48 WHERE district = "Washington 4"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_1805191_48 (first_elected VARCHAR, district VARCHAR) Question: How many categories of first elected are in Washington 4 district?  [/INST] SELECT COUNT(first_elected) FROM table_1805191_48 WHERE district = "Washington 4" </s>