Hillary Clinton’s Long Path to ‘I’m Sorry’

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DES MOINES, Iowa -- Questions about Democratic presidential candidate Hillary Clinton's emailing practice as U.S. Secretary of State have dogged her campaign for months. Why did she use her own email system? Finally, after months of evolving explanations about her decisions, Clinton tried a different answer: "I'm sorry."

Instead of using the traditional method of a government-provided email address on a government server, Clinton chose to use only a private email address on her own private server set up in her home in New York.

Others in federal and state government have used both government and personal emails during their time in office. But Clinton's campaign hasn't showed precedence of another Secretary of State using a system similar to hers.

Clinton has maintained all along she did nothing illegal and didn't knowingly email classified information. Critics have failed to prove otherwise.

Dozens of Clinton's emails have been retroactively classified. 

CNN tracked the different explanations Clinton has used to attempt to make sense of the situation. 

Clinton's campaign sent an email to supporters Tuesday. The email read, "Yes, I should have used two email addresses, one for personal matters and one for my work at the State Department. Not doing so was a mistake. I'm sorry about it, and I take full responsibility."

The email also included a link for supporters to view the partial collection of emails that have been released to the public. 

Clinton told Channel 13 in July that her emailing situation wasn't "complicated."  Although, days later in Minneapolis, Clinton admitted it was. 

Jerry Crawford, a Des Moines attorney and longtime friend of the Clintons, discounts the impact of the email questions. 

But Clinton's large lead in Iowa is no longer, according to one poll.  She recently launched a $1 million ad campaign to bolster her support in Iowa.