Voting for your own gender or race to break down a barrier, that's fine and anything but racist.  BUT, voting for your own race or gender because you hate or fear the other races or gender, that would be racist or sexist.

I don't hold it against women who want a woman president.  There have been many silly or offensive arguments made for why we HAD to have Hillary as our nominee, but solidarity between women never sounded silly or offensive to me.  If all other things equal, as a liberal man, I would make me feel proud as an American to vote for the first woman for president.  However, the issue of the war in Iraq spoiled it for me with Hillary.  As it is, since Obama has won the nomination, I am VERY pleased, because he is and was against the war, and because it will make me very proud as an American to vote for the first African-American president.