THAT was a dirty trick.
Another dirty trick was pulling out slides the candidates had not seen or reviewed. Think in a courtroom a lawyer could pull that shit on the opposing side? Hell no. It was low-down and just plain not fair. VERY much the graphics/PowerPoint equivalent of "We have a diagram that shows you beat your wife but stopped--when did you stop beating your wife?"
Yes dirty trick.
In the next debate will they show the entire Ted Cruz booger video and then ask Ted, “Senator Cruz, what exactly was that booger on your lip? Why didn’t you notice it was there for so long and why on earth did you swallow it?