In Philadelphia, Clinton appeared with her husband, the former president, and their daughter, Chelsea, before a crowd at the University of Pennsylvania.
"It's not enough to say 'Yes we can.' We have to say how we can," Clinton told the crowd, putting a twist on Obama's popular slogan of hope.
The Obama campaign moved quickly to counter the message, airing a response ad within hours that challenged Clinton's 2002 vote authorizing the U.S. invasion of Iraq.
Obama addressed the matter himself at the Pittsburgh rally.
"My job as commander in chief is to keep you safe. That will be my number one task," adding, "The war in Iraq was unwise."
Um, it's a draw? Both are completely unfit to govern. But I'll give Hillary this round.