It was supposed to go so smoothly. On Sunday afternoon — as good patriotic Americans were doing literally anything else but following political drama out of Washington — President Joe Biden artfully dropped the news that he wasn’t going to be seeking a second term, after all. A few hours later, he officially endorsed Vice President Kamala Harris, seemingly precluding an ugly convention fight. Except the two biggest names in Democratic politics not named Harris and Biden — former President Barack Obama and former House Speaker Nancy Pelosi — didn’t endorse Harris when they paid tribute to B…