I think it would be a great mistake by Obama if he picks Hillary as his running mate. This campaign has been about "Change" and no one knows the old politics of the White House better than the Clintons. People who have supported him so far would feel betrayed if he chooses Hillary. And about unifying the party to beat McCain-- this guy has come this far on his own, he does not need the help of Clintons to do that job for him.