These days, obstruction by the Democrats grabs the biggest headlines when they prevent solutions to the biggest issues – immigration, Supreme Court appointments, infrastructure, and so on – but their obstruction is actually the most egregious when it’s at its most petty. Confirming U.S. ambassadors should be one of the least political things the U.S. Senate does. For most of the country’s history, the process was a mere formality – a president would pick people to serve as America’s chief representatives to countries around the world, and those nominees would almost always be confirmed by voice votes, with little if...