SICK. Disgusting. And yet revealing. Hillary Clinton is staying in the race in the event some nut kills Barack Obama. It could happen, but what definitely has happened is that Clinton has killed her own chances of being vice president. She doesn't deserve to be elected dog catcher anywhere now. Her shocking comment to a South Dakota newspaper might qualify as the dumbest thing ever said in American politics. Her lame explanation that she brought up the 1968 assassination of Robert Kennedy because his brother Ted's illness was on her mind doesn't cut it. Not even close.