I personally think Claire McCaskill, candidate for U.S. Senator in Missouri, has the right message; she was recently interviewed in the New Yorker Magazine:

"Being a Democrat is about balance. It's about being moderate and truthful and strong. Harry Truman, leaders like that, they were strong enough to take on foreign enemies when they needed to, but they were also strong enough to know when not to fight, when to use other weapons besides military force. That's the message the Democratic Party should be sending. We should let the American people know we want to work with allies, work with the U.N., and that we don't like war, but that we'll defend this country's interests with everything we've got."