The bromance has long ended and the bitter battle is only beginning to rage between Donald Trump and Ted Cruz as the Republican presidential primary devolves into a slugfest now that the crowded field is winnowing down to let the dominate contenders duke it out leading into the New Hampshire primary. But first, the results of Monday's Iowa caucus continue to be a point of contention days after Cruz was declared the winner. On Tuesday, Cruz was forced to apologize to Ben Carson's campaign for misleadingly suggesting to caucusing supporters that the retired neurosurgeon planned to drop out of the...