Why slimy??
How did you learn of your own ethnic heritage? From your family, right? Was it only Great Uncle Ernie? Or weren't there memes that circulated among many family members, including your immediate family? Dad at a pizza parlor, "Oh, did you know - there's some Italian background in our family on your mother's side. One of her grandparents, or something like that, came into New York in steerage from Florence." You ask your Mom. "Oh, it was my great grandfather alright. I never met him before he died. But my mom told me he was from Italy. Although I think it was Naples." Next family get together Uncle Sal starts talking about how your family has Polish roots. So you ask him about this Italian background. He says, "Yep! I don't quite remember how, but sure. Somewhere in there. Probably why you love garlic, ha, ha." Etc...
That's how it worked in my family. Yours? How else could I have learned any of this stuff? Did I demand documents? Did you? I checked (and check) the Caucasian box on the forms because that is what these family stories told me I was. Assuming you checked an ethnicity box at some point, how did you choose? There were no DNA tests for most of the time I (and I presume you) was checking these boxes. Family memes. I haven't felt the need to run any DNA tests on me now before I fill out the next form. In fact these boxes are for the ethnicity with which one identifies. They do not require physical proof (before very recent DNA testing none was available) and there is no genetic minimum that qualifies one.
These exact same considerations apply to Senator Warren. She learned of her Native American ancestry through the exactly same type of family memes we all learn of our own ancestry. At a time when there were no DNA tests, and family stories were the only way to learn of such things. And although family stories are usually a bit vague and differ a little from teller to teller they all indicated there was some Native American ancestry in her. And she was proud of that enough to tell that part of her story to others from time to time when the issue of ethnicity came up. Just as I would. I check the Caucasian box on most forms, but if a waiter at a Jewish deli asks me, "Hey where did you learn to like gefilte fish?" I would tell him the other ethnic truth about me, I am Jewish too. And most significant of all, now, with DNA testing available to her Warren's family stories have been confirmed as true. In contrast, my Caucasian/Jewish family stories have never been confirmed by DNA testing although I still accept them. Yours?
"Taking away a true Native American's position" from that directory? Was there a limit on the total number of listings? Warren had and has every reason to identify as having Native American heritage (she does). In contexts where her Native American heritage was not relevant she indicated what she always maintained was the majority of her heritage, Caucasian (based on her family stories of course). But when the issue was relevant, a directory of Native American attorneys, she said, hey, that includes me, and was listed. Notably clients are comforted by being able to connect to their attorneys, and Warren's correct identification as having Native American ancestry was something she could offer as a re-assurence and a comfort to potential clients who are traditionally underserved by the legal profession. You see it as her illegitimately lying to attract more clients. I see it as her reaching out to a under-represented group using her own family story (a true one). In fact I doubt that Native Americans are a large enough, wealthy enough population to be a much of a target for a greedy lawyer.