Bill Clinton NEEDED to look like he had an entertaining or engaging side. His Arsenio appearance was after he spoke for what seemed like a month at the DNC convention in '88. He was boring and showed virtually no charisma. That late-show appearance was precisely what he needed.
No one outside of Palin's groupy-like-cult thinks she's a serious person. In other words, she needs to stay off of The Tonight Show, The O'Brien Show and the Oprah Show and start demonstrate her intellectual bona fides to the people who are convinced she's a light-weight, which is not an insignificant number of people.
You don't want someone who's a real, down-to-earth working middle-class person as President, you want Adlai Stevenson...