Most "serious" trap shooters use an over/under, as this supposaidly cuts down on parallax error. Personally, I disagree with this, but then I squint and shoot with one eye, so the balance and "platform" of the side-by-side work better for me.
Getting back to the topic, Kerry has been known to go out and shoot upland game, and this is likely his upland game gun. Of course, it's also one of those hyperexpensive doubles (typically $3000 and above new) that's popular with the "English Tudor" set...
Well maybe, but when he was pheasant hunting in Iowa, he used a long barrelled side by side, not a short barrelled under/over. The short barreled "upland game" gun would be better for skeet than trap. Trap is more like shooting ducks or phesants, Skeet more like shooting quail or dove. Besides, the stock looks much too short for him. You can't hit beans with a shotguns whose stock doesn't fit. I have to put spacers in standard stocks to make them long enough for my guerilla arms.