TROUBLE IN PARADISEOh-oh. “Tense” relations between John and Sarah. We had some inklings of this in an item yesterday. Now it breaks out on national television, and Chuck Todd tells it like it is: they know they’re losing, they’re each blaming the other, and they aren’t comfortable with each other (“yet,” he adds as an afterthought).I’m sure McCain is thinking “I WANTED to choose my good pal Joe