CREATE TABLE table_18521 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" CLOB, "Result" CLOB, "Candidates" CLOB)

What party did incumbent Wright Patman belong to?
SELECT "Party" FROM table_18521 WHERE "Incumbent" = 'Wright Patman'
SELECT "Party" FROM "table_18521" WHERE "Incumbent" = 'Wright Patman'