"Because my mother told me so. This is how I live. My mother, my grandmother, my family. This is my family. Scott Brown has launched attacks on my family. I am not backing off from my family.”So it seems the argument is: She believes something she heard from her family, and if you question the factual soundness of what she believes — or ask additional questions about the consequences of the fact believed — that you are attacking her family.
Does that make any sense? It makes a little sense to say: Hey, this is a family story, and it means a lot to us, among ourselves, and it's unkind of you to intrude into our very personal intimacies. You are attacking the cozy warmth within our home. That would make sense if it were irrelevant whether she were Native American or not. It could just be something you believe, like you believe your father loved your mother or that you were the cutest little baby in the world. You're not arrogant or a fool for believing things like that and never inquiring more deeply, and a political opponent or a reporter that gets all pushy about the factual content of such beliefs is a big clod and could be told so.
But... if you sought career advancement by making a claim that was not factually grounded, then it is relevant as you seek political office. It goes to your character, your honesty, your fairness. Now, it might nevertheless be something of an answer to the question to say: You know, I now realize that I didn't have an absolutely sound basis to believe what I believed, but I did genuinely believe it. And I know that I did expose this belief in a way that could have attracted benefits, and I did come to regret it. I've forgiven myself, and I ask you to forgive me, because my mistake was a daughter's belief in what her mother told her was true, a granddaughter's belief in her grandmother's knowledge and honor.
If she came that far, and Scott Brown were to respond: Your mother and your grandmother were either liars or fools — that would be an attack on her family.
That hasn't happened, and who can imagine it would? Thus, the inappropriate attack here is on Scott Brown, because he has not attacked her family.