'A Pickle Stepping Into History'. I'm still stumped.

I'm apparently not the only one perplexed by President Clinton's weird line. I've gotten about a dozen google hits for variations of the phrase. I see a couple of other sites talking about it too, but so far no definitive answer to "what the hell is he talking about?" Zack offered a suggestion on my last post:

The only way it makes any kind of sense is if you think of the British meaning of pickle -- that is, a "mischevious or troublesome person."

But that doesn't seem to fit either. Seriously, what's the deal? Bill Clinton is a reasonably cogent person. He wouldn't just spout gibberish. Somebody, please tell me what this odd phrase means, such that I can start using it myself on appropriate occasions.