CREATE TABLE table_18380 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Which district elected incumbent Earle Cabell?
SELECT "District" FROM table_18380 WHERE "Incumbent" = 'Earle Cabell'
SELECT "District" FROM "table_18380" WHERE "Incumbent" = 'Earle Cabell'