I didn't think we could do it again this year. And that has nothing to do with the fact that I'm not around cracking the whip. The main reason is that Bill Clinton is not the challenger anymore. But on the whole, it's easier to run as a challenger. Incumbents' campaigns are usually as big, lumbering, and uncoordinated as a drunken hippo.
Challengers can be much more fleet afoot.
As an incumbent, you might be the best campaigner in the world, but you still have to deal with the full-time demands of running the country. Dole, in contrast, is free to do nothing but stage campaign events and work on his tan. An incumbent has the dead weight of a huge entourage every time he wants to go out on the road. Not only does that entourage make logistics a nightmare and slow everything down, it also costs a hell of a lot to move it around. An incumbent has to deal with tighter security, which restricts what you can do and how quickly you can do it.