After a second reading, I think you are saying women voting for women simple because they are the same gender, black people voting for blacks because they are the same race, etc.
If that were true all white women would have voted for Hillary. All white men would have voted for Donald Trump. Gay people would only vote for LBGTQ candidates. Etc.
That's not true. I am a white woman who will not be voting for Kim Reynolds for governor of Iowa because of her policies toward education as well as other issues. I voted for Barack Obama because of his policies not his race. I did vote for Hillary who is also a white woman, but it was not because of her gender or race it was because her policy ideas were more in line with mine. Who do you know who votes for someone simply because that person is of the same race, gender, sexual identity, etc?