This 5-year-old presidential expert is one of the most hilarious and adorable guests of all time.\rbr\rbrEllen sent her young presidential expert on the trip of a lifetime.\rbr\rbrEllen Meets Macey Hensley.\rbr\rbrYoung presidential expert Macey Hensley took an unforgettable trip to the Reagan Library!\rbr\rbrEllen challenged Kevin Spacey, the President on House of Cards, and her presidential expert Macey to a trivia game for the history books.