CREATE TABLE table_18488 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

Omar Burleson was the incumbent in what district?
SELECT "District" FROM table_18488 WHERE "Incumbent" = 'Omar Burleson'
SELECT "District" FROM "table_18488" WHERE "Incumbent" = 'Omar Burleson'