I want to call your attention to a very interesting article published by HuffingtonPost.com this morning.
The author, Manisha Sinha, sees a parallel between the 2008 Democrat nominees and the Republican nominees of 1860. Specifically, Sinha pictures Obama as Lincoln, while Clinton most closely resembles William H. Seward.
I'm not sure if I buy Sinha's analogy, but her observations certainly got my mind running in an interesting direction. I could see a productive classroom discussion coming from this article.