It’s every liberal’s fondest dream and secret hope: Righteously putting down a villain on national television, indignantly shaming the cad before millions and winning moral plaudits far and wide. … It’s what Joseph Welch famously did to Joe McCarthy in 1954 (“Have you no sense of decency, sir, at long last?”) and it’s been part of the liberal catechism ever since. … Mayor Wu used the now-familiar shaming tactic at yesterday’s congressional hearing (“Shame on him …”) – and it seemed to work. Though it did come across as a little stiff and scripted. Maybe the $950/hour prep lawyers suggested she use it?