From the Center The most useful way to think about the Donald Trump-Elon Musk annulment that has preoccupied the political universe for the last week is to regard Musk as the 21st-century version of Marla Maples. (For those with short or selective memories, Maples was the aspiring model and singer who became the second Mrs. Trump back in the 1990s). Trump’s relationship with both ingenues became the stuff of intense gossip for a brief period of time. Both were soon cast aside when Trump...