Well, we're not all as colorblind as you are. Nice tagline, by the way.
It's not basing 'only' on race, but you're fooling yourself thinking that it's not a factor. There are lots of factors that go into selecting a presidential candidate, from education, money (what they have and what they can raise), experience, public image, electability, their relationship with others in the party, etc. Anything that will modify their standing with the electorate is an issue, and that naturally includes gender and ethnicity.
Now, if all a candidate had going for them was gender and ethnicity (like Carol Mostly-Fraud) then I'd agree with you 100%.