CREATE TABLE table_15819 ("District" CLOB, "Counties Represented" CLOB, "Party" CLOB, "First Elected" FLOAT, "Committee" CLOB)

What counties represented have a democratic committee, and a committee of ways and means?
SELECT "Counties Represented" FROM table_15819 WHERE "Party" = 'democratic' AND "Committee" = 'ways and means'
SELECT "Counties Represented" FROM "table_15819" WHERE "Committee" = 'ways and means' AND "Party" = 'democratic'