President Joe Biden made another big mistake. While the commander-in-chief, 81, campaigned in Wisconsin on Friday, July 5, he slipped up again by declaring he would beat Donald Trump “again in 2020.” “You probably heard that I had a little debate last week. Can’t say it is my best performance, but ever since then, there’s been a lot of speculation, ‘What’s Joe going to do? Is he going to stay in the race? Is he going to drop out, what’s he going to do?’ Well, here’s my answer,” Biden told the crowd. “I am running and going to win again!” “Let me say this as clearly as I can, I am staying in th…