Just a matter of when. Trump will use a loss as a way to say things were hacked. His loss will cause more harm than good in the short term.
Hacking An Election: Why It's Not As Far-Fetched As You Might Think
http://www.npr.org/2016/08/01/488264073/hacking-an-election-why-its-not-as-far-fetched-as-you-might-think