CREATE TABLE table_18185 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

what being the minimum first elected with district being washington 7
SELECT MIN("First elected") FROM table_18185 WHERE "District" = 'Washington 7'
SELECT MIN("First elected") FROM "table_18185" WHERE "District" = 'Washington 7'