Hillary on emails: I'm sorry

Hillary Clinton

Former Secretary of State Hillary Clinton took a time-out from presidential campaigning to post an official mea culpa on Facebook, telling her followers she's learned her lesson – she should have used two email addresses, one for personal messaging and one for public business.

"Yes, I should have used two email addresses, one for personal matters and one for my work at the State Department," Clinton wrote. "Not doing so was a mistake. I'm sorry about it and I take full responsibility."

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She underscored her apology with an appearance on ABC News, during which she referenced her private home-based email server that she used for public business and then said: "That was a mistake. I'm sorry about that. I take responsibility."

The apologies and admissions are fast about-faces from interviews just a couple days earlier. On Sunday, for instance, Clinton doubled down on her innocence pertaining to her email server, saying to a national press that "what I did was allowed" by policy and law and no apology was needed. Just a couple days before that, Clinton told Andrea Mitchell on NBC News she was sorry for the confusion that had been generated by her email server, but she didn't see any need to apologize.

Her exact words then: "At the end of the day, I am sorry that this has been confusing to people," she said.

And on Monday, Clinton told the Associated Press she wasn't going to apologize because "what I did was allowed," she said.

Tuesday brought a new message, however.

On ABC News, Clinton told host David Muir the use of her home email server for public business was a "mistake" she was "sorry" for, she said.

She went further on Facebook, trying to clarify that while she made a mistake, she still didn't break law.

Clinton wrote: "It's important for you to know a few key facts. My use of a personal email account was aboveboard and allowed under the State Department's rules. Everyone I communicated with in government was aware of it. And nothing I ever sent or received was marked classified at the time."

She also wrote of her commitment to "be as transparent as possible," and as part of that, said she'd "be testifying in public in front of the Benghazi Committee later next month."

Clinton concluded by saying her story was "complex," but she was nonetheless "grateful" for ongoing political support.

"I could have, and should have, done a better job answering questions earlier," she wrote. "I'm grateful for your support and I'm not taking anything for granted. I understand that you may have more questions and I am going to work to keep answering them. If you want to read more, including my emails themselves, please go here: www.hillaryclinton.com/emails."

Her apology comes as polls show her main Democratic Party contender, Sen. Bernie Sanders, coming on strong in the race for president, and as talk of spooked donors has given rise to pressures for Joe Biden to enter the race.