STEPHANOPOULOS: You've been pretty clear, and we showed it in Jeff Zeleny's piece, that you say you're not running for president in 2016. It seems like you've just affirmed it again. You also signed a letter -- several senators signed a letter earlier this year encouraging Hillary Clinton to run.

So is she your candidate in 2016?

WARREN: You know, all of the women -- Democratic women, I should say, of the Senate urged Hillary Clinton to run. And I hope she does.

STEPHANOPOULOS: You hope she does. And if she does, she is your candidate, you're going to endorse her?

WARREN: If Hillary -- Hillary is terrific.

STEPHANOPOULOS: You know, you've said she is terrific very many times. You say that again in this book, "A Fighting Chance." But this book leaves out something of a pointed criticism from your earlier book, "The Two Income Trap."

There you praised first lady Hillary Clinton for her opposition to this bankruptcy bill pushed by the big banks, but go on to talk about how she, as New York senator, seemed she could not afford that principled position.

Senator Clinton received 140,000 in campaign contributions from banking industry executives in a single year. Big banks were now part of Senator Clinton's constituency. She wanted their support, and they wanted hers, including a vote in favor of that awful bill.

So do you think that -- are you worried that somehow she will bow to big business, those were your words in that book, if she becomes president?

WARREN: Look, I've made it clear all the way through this book and really what I've been working on for the last 25 years, that I'm worried a lot about power in the financial services industry.

"""For example, if you ask people about how they feel about government regulation of business in general, their reaction is largely negative. Over half say they believe that government regulates business too much. But once you start to ask about specific areas of regulation – from automobile safety to health care – people are much more likely to say they want more regulation than they are to say they want less.4 When people consider the specific ways that government programs may lessen dangers and risks for themselves and their families, they become more supportive of government regulation of business and markets."""