It has been Trump's to lose, and he appears to be doing just that. It remains to be seen if he'll be able to rebound like Obama did after getting trounced by Romney in his first debate. It really is possible to overprepare, but The Donald undercut the prep a little too much, methinks. I'll be poll-tracking to see the effects in the coming week or two....
I highly doubt he'll stumble this much on the next debate. He'll learn from this most likely. Hindsight is 20/20, I gotta say, it will surprise me if the next debate goes
this badly for him.
*** up the first one can be a gift in disguise because you learn from it.