Presidential historians disagree with you. McKinley ranks in the top half in surveys going back to 1948, and he has broken into the top third (which, today, would be roughly 15) in many surveys. (See Wikipedia for details).Anyway, I certainly don't see McKinley as being one of the most important American Presidents - I don't even see him making the top 15. Which, out of 43, isn't that great.
I think bigger -- indictment for war crimes and crimes against humanity in the Hague.You know what would have been wish fulfillment for me? The Federation Council passing articles of impeachment against Min Zife and him being indicted by a Federation Grand Jury. That would have been liberal wish fulfillment, because that's what we liberals wanted to see happen to George W. Bush. And that didn't happen in the novel.

However, just to show that I'm equal opportunity, I'd also like to see Obama indicted for crimes against humanity for condoning, if not outright approving, the torture of Bradley Manning at Quantico, which Hillary Clinton's own spokesperson has spoken out against publicly.