A studies done by Politfact and The Washinton Post showed Clinton lies on 28% of her statements compared to 73% of Trump.
Edit: http://www.politifact.com/personalities/donald-trump/
http://www.politifact.com/personalities/hillary-clinton/
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I don't think he's necessarily Lying per se... Probably more like he's stupid enough to believe what he's saying... Regardless of what he's saying...