Watch: Hillary Clinton Won't Run Again, But She's Not Leaving Politics

NEW YORK, NY — Defeated but not deterred, Hillary Clinton says she is not leaving politics. She does not, however, intend to run again as a candidate for public office.

The former secretary of State sat down with Jane Pauley of "CBS Sunday Morning" to discuss the election, her plans for the future and her new book "What Happened." (For more information on this and other political stories, subscribe to the White House Patch to receive daily newsletters and breaking news alerts.)

Clinton said she was completely "gobsmacked" by the election result, when she unexpectedly lost the presidency to Donald Trump. She hadn't even written a concession speech.

"I'd been working on a victory speech," she said.

She added: "I felt like I had let everybody down."

But will she ever try again for the Oval Office? "I am done with being a candidate," she told Pauley. "I am not done with politics because I literally believe that our country’s future is at stake."

The past is not yet entirely behind her, however. Clinton took former FBI Director James Comey to task for his treatment of her during election. She took umbrage with the fact that he first broke with protocol by criticizing her even while announced no charges at the end of the famous email investigation, and then he dredged up the issue again less than two weeks before election day. All the while, she points out, the FBI was investigating links between Russia and the Trump campaign, about which Comey remained silent.

Nevertheless, she admits she made some mistakes: "I think the most important of the mistakes I made was using personal email,” Clinton said.

"What Happened" hits the shelves everywhere on Tuesday, Sept. 12.

Watch the interview below:

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Correction: This story initially misstated the release date of "What Happened." Photo by Scott Olson/Getty Images