Yesterday we reported that Donald Trump and Ted Cruz seemed to be preparing to go to war with each other. A few hours later, however, Cruz himself responded on Twitter by saying that, although the media would love to see a cage match between himself and the billionaire businessman, he won't play along. That could -- and by all means should -- have been the end of it. Sadly it is not. Trump can also read polls and understands that Cruz poses a serious threat to him in Iowa. And so the cage match has started, whether Cruz likes it...