CREATE TABLE table_712 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

Which candidates are from the Missouri 3 district?
SELECT "Candidates" FROM table_712 WHERE "District" = 'Missouri 3'
SELECT "Candidates" FROM "table_712" WHERE "District" = 'Missouri 3'