Donald Trump says that Ted Cruz has flip-flopped on the ethanol mandate, formerly wanting it abolished immediately and now wanting it abolished after a five-year phase-out. This is hardly a major change of position, but Trump is right that Cruz changed his position on ethanol in 2014 from totally ending the mandate to a gradual phase-out. But 2014 was so long ago that in 2014, Donald Trump was a liberal Democrat. If Donald Trump wants to catalog flip-flops, he should start with these: 1) Trump has said that the economy "does better under the Democrats than Republicans." 2) He has...