OWOSSO, Mich. —Armed members of the Michigan Home Guard stood outside Karl Manke's barber shop, ready to blockade the door if police arrived. They were determined to help Manke, 77, reopen his shop Monday, in defiance of state orders, and dozens joined them, wearing Trump sweatshirts and Trump cowboy hats and waving Trump flags. They gathered not because they desperately needed haircuts but to rail against Democratic Gov. Gretchen Whitmer’s approach to fighting the coronavirus outbreak in Michigan, one of the nation’s worst hot spots. They were channeling President Trump’s support of such protests, but some also were taking aim...