Clinton's warning to rivals via Bill

"I saw female lions go after warthogs while the male just laid there and watched. Which I thought was good preparation for my future, given this campaign, you know. Just sort of lay there and watch, you know... Right in front of our vehicle this female lion caught this warthog, picked him up by the back of the neck, and went like that and broke his neck. It was pretty gory. So much for peace in our time," - Bill Clinton on Letterman.