What does this mean?

According to my best intuition, the photo shoot banter went like this:

George H.W. Bush: "I know Barack, you are a lot smarter than Junior."

Barack Obama: "Yeah, and I'm a lot cooler."

George W. Bush: "Homerun! heh, heh."

Bill Clinton: "This furniture would probably look good in my office."

Jimmy Carter: "I need to keep my distance, because if I catch cold the doctor said I would disintegrate."

...or something like that.