Well, she obviously took the private test and hired Bustamante because the tests you and I take wouldn't show what she needed to show.
The Boston Globe reports here:
The inherent imprecision of the six-page DNA analysis could provide fodder for Warren’s critics. If her great-great-great-grandmother was Native American, that puts her at 1/32nd American Indian. But the report includes the possibility that she’s just 1/512th Native American if the ancestor is 10 generations back. ...
Detecting DNA for Native Americans is particularly tricky because there is an absence of Native American DNA available for comparison. This is in part because Native American leaders have asked tribal members not to participate in genetic databases. ...
To make up for the dearth of Native American DNA, Bustamante used samples from Mexico, Peru, and Colombia to stand in for Native American. That’s because scientists believe that the groups Americans refer to as Native American came to this land via the Bering Straight about 12,000 years ago and settled in what’s now America but also migrated further south. His report explained that the use of reference populations whose genetic material has been fully sequenced was designed “for maximal accuracy.” ...
Ivy League universities, like the ones where Warren taught, were under great pressure to show they had diverse staffs.
The University of Pennsylvania filled out a document explaining why it hired a white woman over minority candidates — clear evidence it didn’t view her as a Native American addition. And the Globe interviewed 31 Harvard Law School faculty members who voted on her appointment there, and all said her heritage was not a factor.
Update: The Boston Globe has amended the first paragraph above as follows:
The inherent imprecision of the six-page DNA analysis could provide fodder for Warren’s critics. If O.C. Sarah Smith were fully Native American, that would make Warren up to 1/32nd native. But the generational range based on the ancestor that the report identified suggests she’s between 1/64th and 1/1,024th Native American. The report notes there could be missed ancestors.
In other words, Elizabeth Talking Bull could have far less "American Indian" blood in her than originally reported.
Update: The Boston Globe has amended the first paragraph above as follows:
The inherent imprecision of the six-page DNA analysis could provide fodder for Warren’s critics. If O.C. Sarah Smith were fully Native American, that would make Warren up to 1/32nd native. But the generational range based on the ancestor that the report identified suggests she’s between 1/64th and 1/1,024th Native American. The report notes there could be missed ancestors.
In other words, Elizabeth Talking Bull could have far less "American Indian" blood in her than originally reported.