Gail Collins: Let’s see what you remember about what’s going on

Happy Independence Day! You definitely deserve a holiday, people. It’s tough trying to keep up on current events when you want to block out four-fifths of what’s going on.But hey, nobody said being a well-informed voter was easy. Let’s see what you remember:1. Having been called “Sleepy Joe” by Donald Trump for months, Joe Biden began trying to dub Trump with the nickname …A. Tweety. B. Sylvester. C. Ramp Man.2. After he lost the primary in New Hampshire, Bid