He said: "Suppose for example you're a voter. And you've got candidate X and candidate Y. Candidate X agrees with you on everything, but you don't think that person can deliver on anything. Candidate Y disagrees with you on half the issues, but you believe that on the other half, the candidate will be able to deliver. For whom would you vote?"
http://thehill.com/campaign-2008/bill-clinton-in-denver-again-undercuts-obama-2008-08-26.html