Talk about adding insult to injury: John Edwards’ campaign spending is under the microscope, and now his DNA might be, as well. His former mistress, Rielle Hunter, has taken Edwards up on his offer to submit to a paternity test to prove he is not the father of her child. The demand comes in the wake of Elizabeth Edwards’ interview with Oprah promoting her new book, in which she spoke of Hunter—not by name, of course—in less than glowing terms. Initially, Hunter had refused the DNA test, saying it would only be an invasion into her privacy. Now the Enquirer reports that a lawyer is in the process of preparing legal action that would force Edwards into the paternity test.