...caucuses had been around for much of the 20th century, but until 1972, party bosses, not ... establishing unpledged "superdelegates," including governors, members of Congress and former presidents -- a modest check that ... themselves; more recent primary cycles have produced Walter Mondale, Michael Dukakis, John F. Kerry and... had his turn in 1988, followed by Robert Dole in 1996 and George W. Bush...