you know what their basic business model is? taking as much money as you can as premiums and pay as little out in health care coverage as possible. that's just not sustainable. >> reporter: we also asked senator warren what her day will look like tomorrow, how is she going to prepare for the big night? she says she's going to go for a walk, she is going to read the news as she always does and she says that she is not going to do mock debates. i thought that was really interesting because you might know that she was a high school debate champion. so clearly trying to show that she is confident and she is really folkcused on thinking through the debate ideas she is promoting tomorrow. >> m.j., thank you very much. as we head into the cnn presidential debates, let's talk about the candidates like senator kamala harris, rolling