I’ve changed my mind: This week’s presidential debate matters. Before I continue, a quick recap: Last month, I expressed my long-standing view that presidential debates aren’t very meaningful and are very stupid. Even debate lovers concede that John F. Kennedy won the first presidential debate in 1960 because he was telegenic and Richard Nixon looked like he woke up in a motel room after a bender. The takeaway from presidential debates tends not to be a policy position or plan but rather a comfort level with the idea of a person being in our faces for four more years. I don’t think debates are a good test of presidential fitness, but for a lot of voters, this debate could be a decisive test of Biden’s mental fitness.