Responding to the deaths of 13 service members and the wounding of 18 others in Afghanistan, President Biden stated the obvious: “Been a tough day.” Eight months into his presidency, these are tough days. Our withdrawal from Afghanistan is “messy,” as Biden has ruefully acknowledged. COVID-19 is filling up hospital beds and intensive care units. The Supreme Court has reversed Biden executive orders on immigration and rent relief. Biden’s honeymoon, such as it was, is over. Low polling numbers often show how many people stick with you through good times and bad. Back in 1992, Bill Clinton was beset by...