As far as I can tell, from a complete outside pov, Clinton did not lose because she's a woman and Obama did not win because he's black, nor indeed vice versa*. That makes me extremely happy. Sections of the media, and even some campaigners, tried to make this about racism and sexism but it seems good sense prevailed - I don't see the policies that Clinton and Obama touted as being vastly different (tho' I'm open to correction on that one) and I think the nomination was won and lost on charisma, expectation and overall suitabilty and, having paid slightly more attention lately, I think the better candidate won.
Still, I don't think an Obama Presidency is on the bag. I understand what you mean, HyperHulk, when you say "Clinton was a tougher opponent than McCain could ever be and Obama defeated her" and that would indeed be true if the electorate in the two 'competitions' were the same. But you can't compare an electorate of mainly card carrying Democrats** to an electorate of the general population. I hope Obama does win - I think the US needs a Democratic Presidency, I think it will go a long way to helping America bridge some of the divides springing up with the rest of the world as well as being good for America as a country.
* By which I mean Clinton didn't lose because Obama is black and Obama didn't win because Clinton is a woman.
** Again I'm open to correction, maybe there are more open Primaries than I think?