He could have disavowed the sleazy tactic of attacking his opponent's wife. And it was a different story when Trump responded with a pic of Cruz' wife, wasn't it?What would he disavow? What was false or untruthful about it?He's not forbidden by law to disavow the ad though, is he?OK, two points because you're kinda slow:
1) It was not the "Cruz Camp" that ran the ad showing actual nude pics of Melania. It was a PAC and the Cruz campaign is FORBIDDEN BY LAW from coordinating with a PAC.
2) Glenn Beck is a radio talk show host and entertainer. He is not a "Cruz surrogate" any more than David Duke is a Trump surrogate.