Harley-Davidson: Can the quintessential American brand ride out Trump's tweet storms?

Go hunting for the Harley-Davidson origin story, you'll end up in the black smoke and workshop tinkering of the early 1900s. But the true jumpoff point for understanding the modern American motorcycle manufacturer is May 6, 1987 - the day the Gipper blessed the brand.

Wearing a light-colored suit as he bounced up a platform at the company's plant in…