CREATE TABLE table_57368 ("1973 Democratic run-off primary" TEXT, "Manhattan" TEXT, "The Bronx" TEXT, "Brooklyn" TEXT, "Queens" TEXT, "Richmond [Staten Is.]" TEXT, "Total" FLOAT)

Which Manhattan number appeared when Richmond (Staten Island) was 78%?
SELECT "Manhattan" FROM table_57368 WHERE "Richmond [Staten Is.]" = '78%'
SELECT "Manhattan" FROM "table_57368" WHERE "Richmond [Staten Is.]" = '78%'