I can't imagine that it swayed any votes even subconsciously.
"Conventional" wisdom is that it was a negative because it was the thing people were talking about rather than Mitt or Mitt's speech.
However, if it means that people won't remember Mitt's substance-free speech full of platitutes about parent's love and how the Rs all rallied around Pres. Obama with their support after the 2008 election, Clint was a net positive for him.
Reporter: "I guess the question is: Why should Americans trust you when you accuse the information they receive as being fake, when you're providing information that is not accurate?"
TRUMP: "Well, I was given that information. I was, actually, I've seen that information around.