You evidently don't recall the Democrats who met with Saddam prior to the invasion -- Jim McDermott and David Bonior, both House members, who stood on Hussein's balcony with him and willingly propagandized for him.
Or how about Senator Rockefeller who, just prior to the Iraq invasion, travelled to Syria to meet with Bashar Assad? Rockefeller told Assad that Bush meant to invade Iraq and that he should warn Saddam of this so that he would be prepared.
As a group, Democrats have gotten into the annoying (and thoroughly dangerous) habit of conducting their own foreign policy -- most of it independent of and counter to the interests of the United States.
That Obama would attempt to actively undermine ongoing negotiations between the United States government and a foreign power is, unfortunately, consistent with Democrat party practice.
I recall all of that, and more. And that BO would do likewise is all too likely, but during a presidential campaign? Not even Obama can think himself that infallible.