I think it would be a good thing for the US to have a black president or a female president, because it may help to decrease racism and sexism here. However, Hillary is my least favorite of the Democratic candidates. It isn't because she's a woman (I'm about as egalitarian as they come on that!!!), but I think a lot of people hate her because she's a Clinton, and she would not be electable. Plus on that "Pick your candidate according to the issues" quiz, she came in last as a matchup for me of the Democratic candidates. I think a different woman would be a better candidate. Not really sure who though..I'm not all that familiar with many of the women in Congress. One I really do like is the representative from Indianapolis, Julia Carson (and she's both a woman and black), but she has health problems that would probably interfere with any consideration of candidacy.
I like Obama though, and he was one of my top candidates on the "pick your candidate" quiz.