Race is a political stunt from both sides.
-The right questioning her race
-The left using her race to push/advertise her
But there is a big difference in that one side considers racial background a negative factor in her character, and the other a positive factor. America has long proudly advertised itself as a "melting pot" of many nations and races. Our long journey to overcome a deeply embarrassing legacy of racial discrimination is enshrined in history, and we even have a national holiday to celebrate Martin Luther King, Jr., a man who made great strides in overcoming racial barriers to social advancement. Kamala Harris, like Barack Obama, stands as testimony to our ability to now elect people of color to the highest office of government. She would also demonstrate a breakthrough for women, who have historically also been discriminated against.
So please don't call a celebration of her race and gender a "political stunt" in the same sense that racebaiting behavior is. We should not vote for her because she is simultaneously African, Asian, Caucasian, and female. We should celebrate the possibility of voting for her at all in a major national election, but we should still vote for the person we consider best qualified to be elected regardless of race and gender.
ETA: BTW, I am half Polish by ancestry, and I have a Polish surname that makes it difficult for people to pronounce it. If I were to run for public office, that would be a negative factor, but I would still not try to suppress or downplay my Polish ancestry. I'm rather happy to be identified in that ethnic slot, and maybe that would garner me some extra votes in Polish-American communities (e.g. Chicago or Detroit). So, in an election, I would likely use that background to get votes, but an opponent could go into those Polish neighborhoods and point out that I'm not Polish enough to merit their votes. It would be silly, because, again, it should be about the best qualified candidate, not who my ancestors were. But politics is what it is.