CREATE TABLE table_5312 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" TEXT, "Result" TEXT)

Which democratic incumbent is from the district of ohio 7?
SELECT "Incumbent" FROM table_5312 WHERE "Party" = 'democratic' AND "District" = 'ohio 7'
SELECT "Incumbent" FROM "table_5312" WHERE "District" = 'ohio 7' AND "Party" = 'democratic'