[Patrick C]

"The bullet entered his back and exited his chest, blowing away a portion of his rib (10 cm as I recall) and then exited his chest and broke his radius bone in his right wrist before then hitting his left thigh. If this is true, where is the blood on Connally's white shirt when you look at frame 266?"

Very little of his shirt is visible. I would not expect blood to be noticeable on the collars and cuffs and nor should anyone.