Her ethnic origin is not the issue. The issue is her recent job performance, her past job performance, her proposed policies, and her willingness to capitalize off the color of her skin and her gender, instead of the merits of her ability, to further her career. 

https://www.reuters.com/article/world/fact-check-kamala-harris-did-not-switch-from-identifying-as-indian-american-to-idUSKBN25H1Q9/

https://www.businessinsider.com/californias-kamala-harris-becomes-first-indian-american-us-senator-2016-11