CREATE TABLE table_29251 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "Elected" FLOAT, "Status" TEXT, "Result" TEXT)

How many incumbents were the result of sanford bishop (d) 57% joseph mccormick (r) 43%?
SELECT COUNT("Incumbent") FROM table_29251 WHERE "Result" = 'Sanford Bishop (D) 57% Joseph McCormick (R) 43%'
SELECT COUNT("Incumbent") FROM "table_29251" WHERE "Result" = 'Sanford Bishop (D) 57% Joseph McCormick (R) 43%'