def poll(method, *args)
      authorities.select { |a|
        a.respond_to?(method)
      }.collect { |a|
        [a.send(method, *args), a]
      }
    end
def poll(method, *args)
      authorities.select { |a|
        a.respond_to?(method)
      }.collect { |a|
        [a.send(method, *args), a]
      }
    end
Invokes the specified method with the specified arguments on all
 the authorities which will respond to it.