My Grandpa and I used to sing a chucklesome tune. He would start off saying, "Hey Joe, what do ya know?" to which I would reply, "I don't know nothin', tell me somethin'." Â Neither of us could sing very well, but we both found the jingle humorous. That little ditty also happens to describe what will have to be the cornerstone of former Vice President Joe Biden's 2020 presidential campaign. In order for "Diamond Joe" to win in this far-left, progressive field of candidates, Joe will have to pretend that he didn't "know nothin'" about a variety of issues, behaviors,...