CREATE TABLE table_18411 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

Who ran in the race for Jack Brooks' seat?
SELECT "Candidates" FROM table_18411 WHERE "Incumbent" = 'Jack Brooks'
SELECT "Candidates" FROM "table_18411" WHERE "Incumbent" = 'Jack Brooks'