The idea came to George Davey like a vision. In his backyard, which overlooks one of the busiest streets in this bustling suburb of the Iowa capital, he would build a giant sign -- a mini billboard, if you will. And it would feature the photo of his chosen candidate in the upcoming Iowa caucuses: Donald Trump. Last fall, Davey, a 49-year-old computer engineer and father of two, casually mentioned his plan to his wife -- intentionally leaving out the key detail that it would be a very large sign. He knew she'd probably stop him if she knew exactly...