Accusing Senator Ted Cruz of voter fraud, Donald Trump today argued that Mr. Cruz "stole" the election in Iowa. "That is why all of the polls were so wrong, and why he got far more votes than anticipated," Mr. Trump said on Twitter, suggesting no one predicted that Mr. Cruz would win: Ted Cruz didn't win Iowa, he stole it. That is why all of the polls were so wrong and why he got far more votes than anticipated. Bad!— Donald J. Trump (@realDonaldTrump) February 3, 2016 Mr. Trump then went further, saying Mr. Cruz committed fraud, suggesting that Cruz's...