The left-wing, so-called “fact checking” site Snopes worked diligently to spin a story about Joe Biden wearing a construction hard hat backwards during a campaign stop, but the site failed so badly at running flack for Biden, it had to reverse its own ruling Saturday. Before it got to Snopes, the story about Biden wearing the hard hat backwards began tearing through social media after Minnesota’s Democrat Sen. Amy Klobuchar posted a photo on Thursday of Biden standing with several construction workers when he visited a bar in Superior, Wisconsin. Nothing like having a beer with some great unio…