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Trump a perfect ten across all three categories.
Sanders a 1 for lying, a 6.5 for dumb (on the strength of his grasp of economics) and a 10 for unrealism.
Clinton a 10 for lying, a 2 for dumb and a 3 for unrealism.
Cruz a 10 for unrealism, a 1 for dumb and a 4 for liar.
Pick your poison! As always, your mileage may vary.