I suppose the charitable explanation is that he's trying to be folksy. But notice the exaggerated hand movements, the bit about "The most important per--Michelle Obama"; that definitely sounds like he's a little squiffy.
Cited for Breaking the Christmas in Cambodia story (at Kerry Haters):
Hugh Hewitt: KerryHaters was on this story a long time ago. How could the elite media not have asked these questions before now?
Ankle-Biting Pundits: Our friends Pat and Kitty at Kerry Haters deserve the blog equivalent of a Pulitzer for their coverage of Kerry's intricate web of lies regarding Vietnam.