When Jeanine Pirro announced her interest in running against Hillary Clinton, she reminded reporters who dismissed her chances: "I'm a fighter." But already Pirro appears to be unilaterally disarming - by issuing a promise not to fight back against a vicious series of personal attacks by Mrs. Clinton's media surrogates. "Republicans who want us to throw mud at [Hillary] will be disappointed," Pirro campaign manager Kieran Mahoney tells New York magazine, before stating flatly: "We won’t engage in negative attacks." Asked to certify the no-negative-campaign pledge with a formal promise, the Pirro insider responded: "Jeanine already has." Instead, Mahoney said,...