Human beings are imperfect.And some are more imperfect than others.So, elections are choices among imperfect alternatives.A voter's task is to choose the best available viable candidate.Rudy Giuliani WAS preferable to his predecessor as Mayor of New York City, David Dinkins, notable as New York City's first African-American mayor and a very good dresser.Giuliani lost to Dinkins the first time, but, after Dinkins' dangerously inept handling of the Crown Heights riot, not even the Democrats could stop Giuliani from winning the rematch .Guiliani WAS a great improvement.He made New York City a safer and more enjoyable cityAnd the thought of Dinkins...