The former president, speaking in Denver, posed a hypothetical question in which he seemed to suggest that that the Democratic Party was making a mistake in choosing Obama as its presidential nominee.
He said: "Suppose 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 candidate can deliver on anything at all.
Candidate Y you agree with on about half the issues, but he can deliver. Which candidate are you going to vote for?"
As if to cover his backside, Clinton added "This has nothing to do with what's going on now."
The controversial comments came just hours before Sen. Hillary Rodham Clinton (N.Y.), the former first lady and principal rival to Obama, was due to speak from the convention podium.
In a convention that continues to be racked with stories and questions about how unified the Democratic Party truly is, Clinton's appearance Wednesday — and his tendency to go off the teleprompter — has some Democrats very nervous.