NEW YORK Even as Hillary Clinton worked to defuse her Friday comment about the 2008 campaign and the Robert Kennedy assassination, a Fox New contributor went much further, joking about someone actually targeting Barack Obama. Appearing on Fox News today, Liz Trotta, a former editor with the Washington Times and reporter the Chicago Tribune and Newsday, was asked by the host, Eric Shawn, about the Clinton controversy and the 2008 race. This led Trotta to refer to the Clinton misstep, in which she mentioned the RFK killing to show (the candidate later claimed) that previous campaigns, like the current one,...