The attack that left Republican Sen. Rand Paul with six cracked ribs outside his Kentucky home came after a long-simmering disagreement with a 17-year neighbor over grass clippings, according to a report. An acquaintance of both men said the fellow doctors stood in their yards about 10 years ago and shouted at each other about grass clippings that Paul’s lawn mower sprayed onto Boucher’s property, the Washington Post reported. The feds said they are investigating the case, in which Boucher could be charged under federal statutes that include a provision that bars assaults on members of Congress and other high-ranking...