I don't think any president should had gone on that show either, it serves the same purpose Leno's show serves. To promote forms of media that the blindfull masses will run out in droves to have.
I don't thin Nixon or Kennedy where good leader either, one of them got us involved in a war that killed over a million people and the other was a crook. Furthermore we aren't electing glamor queens to sit in the oval office and play president, we are electing leaders and Americans shouldn't be coaxed into electing glamor queens.
You talk as if being a in the lime light is good for there appearance, but why is there appearance so god damn important? That is the kind of reason why we have a bunch of nobodies in Washington that are of any ability to lead, because Americans are more worried about appearances than actual ability to serve the people.