Former Vice President Joe Biden is on the struggle bus. He’s ahead in the polls, yes. But he’s also become a gaffe machine. From not knowing which his current location on the campaign trail to telling fake war stories, Joey has done it all in less than a week. We have a long way to go before Election Day 2020. And a frontrunner who can’t get simple things right has to have Democrats a bit uneasy. Biden is at the top of the heap because of his name recognition and this notion that he can…