vineyard. the late show's david letterman commemorated his presidential vacation with this video last night. >> let's put together a segment about memorable presidential vacations and by god, we have it for you tonight. memorable presidential vacations throughout the years. i hope you enjoy this. ♪ ♪ >> wow. now, now i see why he had the big hat. >> well, the president also introduced the newest member of his family, another portuguese waterdog named sunny who has joined bo another portuguese waterdog at the white house.