Milliband is being criticized for running a bad campaign because UKIP is now taking Labour voters into its camp.
Perot pulled out of the campaign deliberately for a time in 1992 to tamp his vote totals down so he wouldn’t win. He was in to help Clinton.
Farage and UKIP are playing no such game. They are in it to win and might do that today beating all the other parties, not allowing Labour to win.