CREATE TABLE table_28847 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Who were the candidates if the incumbent was Henry Logan?
SELECT "Candidates" FROM table_28847 WHERE "Incumbent" = 'Henry Logan'
SELECT "Candidates" FROM "table_28847" WHERE "Incumbent" = 'Henry Logan'