No. The reality is that Trump, and his supporters, have been very effective at persuading people that Cruz has done some shady things.
Character assassination as perfected by the Clintons.
Cruz has not been effective at countering the character assassination.
If Cruz can't handle that what's he going to do when the full power of the Clinton machine and their media allies start stomping him into the ground without mercy?
Apparently they persuaded the Cruz people themselves, because haven't there been some apologies?
In addition to that, it's quite straightforward to objectively look at some of Cruz's mailer tactics and conclude that some shady things have occurred.
I, personally, am of that opinion, and I like Cruz. But to assert that Cruz is somehow unique, and magically "above the fray", is patently naive and absurd, IMHO.