Washington (AFP) – US President Joe Biden was caught on a live microphone Monday calling a Fox News journalist a “stupid son of a bitch” on the sidelines of a White House photo op. As journalists were leaving the room after the event, a reporter from Fox News, the favorite channel of conservatives, asked whether inflation is a political liability. The Democratic leader, possibly unaware that his microphone was still on, began by deadpanning: “It’s a great asset. More inflation.” And then muttered, “What a stupid son of a bitch,” before glancing briefly down. A pool reporter who was in the roo…