Four weeks after the government moved to shut down Amish farmer Dan Allgyer for selling fresh, unpasteurized milk across state lines, angry moms who made up much of his customer base rallied on the Capitol’s grounds Monday to demand that Congress rein in the food police. The moms milked a cow just across the street from the Senate and served up gallons of fresh milk, playfully daring one another to drink what, if sold across state lines, would be considered contraband product. “The FDA really screwed up this time. They got between a mom and a farmer,” said Mark McAfee,...