CREATE TABLE table_773 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

Who were the candidates when Noble Jones Gregory was incumbent?
SELECT "Candidates" FROM table_773 WHERE "Incumbent" = 'Noble Jones Gregory'
SELECT "Candidates" FROM "table_773" WHERE "Incumbent" = 'Noble Jones Gregory'