The reason why Obama stammers and fumbles when he speaks is because he’s told so many versions of every event that it’s hard to stay on message when everything you’ve said is a lie.
I think you identified it well. This is along the lines of my own personal philosophy: always tell the truth. You know why? Because I don’t have all that great a memory, so it’s real easy when you tell the truth all the time...you don’t have to remember all those sordid, useless details surrounding a lie. Could this be why McCain is so quick with answers and Obama stutters?