He who laughs last ... Dean stopped by a Democratic field office in Henderson last week, and to prep myself for the visit, I watched whats known in political circles as "The Scream." Its still funny. But heres the thing: Dean was right. His hypothesis was simple: To be a national political party, you have to compete everywhere. It was called the "50 state strategy," and it was unveiled in 2005. Remember 2005? Thats when Karl Rove was building a permanent Republican majority,