For a while there last night, it looked like variations on the word joy had a puncher’s chance of outnumbering references to freedom at the relentlessly message-disciplined day three of the Democratic National Convention. When onetime party rising star Sen. Cory Booker (D–N.J.) informed us about one-third of the way through that “tonight is about joy” and “achieving the impossible that should bring us joy,” and that “our nominees, Kamala Harris and Tim Walz, they bring the joy,” the (unofficial) joy vs. freedom count stood at a respectable 21–32. But then Pennsylvania governor, veep pick runne…