That ad being out there is not new. It's covered in the Politifact summary on this. Her story has consistently been that she relied on family stories of Native American ancestry. Over time, she has come to recognize that it is wrong to rely on family lore -- even if genuinely held -- considering the history of Native Americans in our country and has apologized. That doesn't change that she had a genuinely held and important belief that her family had native ancestors.
Warren’s ultimate explanation was she was drawing on family stories.
"As a kid, I never asked my mom about documentation when she talked about our Native American heritage," Warren said in a 2012 campaign ad. "What kid would? But I knew my father’s family didn’t like that she was part Cherokee and part Delaware. So my parents had to elope."
Warren’s extended family offered a mixed take on those stories to Boston Globe reporters.
Gloria Wysong, a cousin, said that her mother told her that the family's heritage "was Delaware, but the Delaware and Cherokee merged together."
And David Herring, Warren’s brother, said he grew up hearing, "Your grandfather is part Delaware, a little bitty bit, way back, and your grandmother is part Cherokee."
But other cousins had no such memories.
The main takeaway from the Globe’s reporting was that many who had Native American ties hid them, and documentation at the turn of the last century was spotty. In any event, any ties were so distant that they would not qualify her as minority by any official yardstick.
Warren herself didn’t trumpet this side of her family story. When applying to college and law school, records show that she either identified as white or declined to apply based on minority status.
https://www.politifact.com/truth-o-meter/article/2017/dec/01/facts-behind-elizabeth-warren-and-her-native-ameri/
My Dad's family is from Oklahoma and my grandmother told me similar stories growing up. She also told me--without evidence-- that we were "probably related to the Wright Brothers" because we had Wrights in our family. All of this is probably false, but that they were part of my families identity is true--and the same goes for Elisabeth Warren.
This is "Hillary's emails" attack against Warren and every democrat should be careful how they use it.