CREATE TABLE table_12487 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Results" TEXT, "Candidates" TEXT)

Which district has an incumbent of Sanford Bishop?
SELECT "District" FROM table_12487 WHERE "Incumbent" = 'sanford bishop'
SELECT "District" FROM "table_12487" WHERE "Incumbent" = 'sanford bishop'