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

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'