KING: New wrinkles today on the controversy Senator Elizabeth Warren just can't seem to shake. The Massachusetts Democrat now facing new questions about why she claimed Native American heritage this time on an official state document. CNN's MJ Lee is here with the details of this developing story that comes -- you see the document right there -- comes just as Elizabeth Warren is prepared to announce her campaign -- formally announce for president. MJ, the senator has taken steps to try to put this in the past. It won't go away.</s>MJ LEE, CNN NATIONAL POLITICAL CORRESPONDENT: That's right. This is a problem that is not going away for Elizabeth Warren. And, John, the reason that this "Washington Post" reporting is significant is because we now have a visual, Elizabeth Warren writing in her own words, in her own handwriting, describing her race as American Indian. So this is not just a checked box and this is -- appears to be an example of Warren herself explicitly describing her race as American Indian, regardless of how long ago this happened. And I should note that a Warren aide was pointing out to CNN that this was not a part of her state bar application, but rather a form that she filled out after she was already admitted to the bar. An obviously important distinction, but I'm not sure, frankly, that this is going to be a distinction that people and voters necessarily understand or care about, particularly those who are already going to be looking at Elizabeth Warren in an unfavorable way for whatever reason. I also wanted to read a statement that we got from Elizabeth Warren's spokesperson. It reads, Senator Warren has said she is not a citizen of any tribe and only tribes determine tribal citizenship. She is sorry that she was not more mindful of this earlier in her career. Now, John, how much are voters going to care about this? It's obviously very, very early on in this cycle.
Warren Answering Questions Over Race.