Thanks for your instructions.
Next time you tell me to do something, please use the word "please." I'm not the neighbor kid walking on your lawn, we're not neighbors, and this isn't your lawn.
One of the disadvantages to jumping into a conversation and then issuing proclamations of this kind is...pretty obviously demonstrated here. As I said at least three times above, the pledge is moral, not legal. Kinda like where you say above "It isn't a legal matter." As such, a non-binding pledge can be withdrawn: kind of like when Trump withdrew what he obviously viewed as a non-binding pledge in the video I posted above. I notice you left out the word "Trump" in your examples of those who know what the pledge means.
In other words, moral pledges have moral implications. This being an Objectivish website and all, I would think this would be intrinsically more interesting to discuss and consider in any event.
I still believe Cruz owed Trump, and his voters, a better explanation of why he didn't keep the pledge. If it will make you feel better, I'll expressly agree he owed it to the RNC too.