Few presidents have taken more public pleasure in seeing one of their party’s own leave office than Donald Trump in his reaction to Rep. Anthony Gonzalez’s announcement that he would not seek reelection. “1 down, 9 to go!” the former president gloated, in the second of two statements he released Friday celebrating Gonzalez’s exit. The Ohio Republican’s departure was, of course, a victory for Trump — the first victim in his post-election crusade against the 10 Republican House members who voted to impeach him. Shannon Burns, the president of Ohio’s Strongsville GOP, said Gonzalez “was an up-and-coming star, who made,...