DES MOINES, Iowa - Ted Cruz arrives Monday for his first Iowa trip of 2016, but he won't just be battling Marco Rubio and Donald Trump. He'll been fending off the state's influential corn lobby. As Cruz kicks off a six-day bus tour across the state, his critics in the state's ethanol industry will be trailing close behind in a RV. They're hoping to highlight the Texas senator's opposition to a federal mandate that ethanol be mixed into gasoline at each of Cruz's planned 28 stops."We're going to be turning out all of our allies," said Eric Branstad, the son...