CREATE TABLE table_742 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

What candidates ran in the election that included john shelley?
SELECT "Candidates" FROM table_742 WHERE "Incumbent" = 'John Shelley'
SELECT "Candidates" FROM "table_742" WHERE "Incumbent" = 'John Shelley'