In a race where Barack Obama's safety is a particular concern, Hillary Clinton's remark that by June 1968, Robert F. Kennedy had been assassinated was appalling. As one commenter put it, the remark was eerily reminiscent of Henry II's "Who will rid me of this meddlesome priest?"
The fact that she later, in the face of popular outrage, apologized to the Kennedy's but apparently not the Obama's is bizarre. See Clinton Sorry For Remark About RFK Assassination, The Washington Post (Friday, May 23, 2008).
Update: Keith Olbermann's commentary.