“He refuses to leave. When we force him away, he just comes back. It’s really been flipping us out…” Such are the quivering words of a flush-faced Stacey Bingham, President Obama’s volunteer coordinator at his campaign headquarters in Washington D.C. No, Ms. Bingham is not talking about Joe Biden. Nor is she speaking of the inevitable horde of creepy, overweight, middle-aged campaign volunteers who smell like a Beluga whale’s placenta that can be found at any campaign’s volunteer offices. Bingham is speaking of none other than Oscar the cat (a.k.a. “death cat,” the “grim purrer,” and “Dr. Catvorkian”), who gained...