Friday Puzzle

I adapted this from a Lewis Carroll conundrum recently posted over at "Futility Closet":

(caution though, this one may give you a headache ;-))

Mitt says that Newt always lies.
Newt says that Ron always lies.
Ron says that both Mitt and Newt always lie.
So, who is telling the truth?

answer below....
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.Answer: Newt tells the truth (...but then we all know better than that)