- October 2010. Gibbs apologizes for American experiments on Guatemalans in the 1940s. "This is — it’s tragic, and the United States, by all means, apologizes to all those that were impacted by this," Gibbs said at a news conference. "The president is slated to call the leader of Guatemala later today and personally express that apology."

- February 2012. In a letter to Afghan President Hamid Karzai, Obama apologizes for the burning of Korans by U.S. troops.

- May 2013. Obama apologizes and says Americans have a right to be angry after revelations that the Internal Revenue Service targeted conservative nonprofits several years previously.

- October 2013. Obama is forced to apologize to German Chancellor Angela Merkel after it is revealed that the NSA was tapping her cellphone.

- November 2013. Obama apologizes to people who had their health insurance canceled. "I am sorry that they are finding themselves in this situation based on assurances they got from me," he said.

- November 2013. The president apologizes to Democrats who have come under fire for supporting Obamacare. "I feel deeply responsible," he said, "for making it harder for them rather than easier for them to continue to promote the core values that I think led them to support this thing in the first place, which is, in this country, as wealthy as we are, everybody should be able to have the security of affordable health care."

- December 2013. Obama apologizes for the Obamacare rollout in broad strokes. "I have acknowledged more than once that we didn’t roll out parts of this law as well as we should have," he said.

The president has also apologized to a number of individuals.

- He apologized for the firing of one-time USDA employee Shirley Sherrod early in his first term.

- In April 2013, Obama apologized to California Attorney General Kamala Harris after commenting on her appearance.

- Last February, he apologized to an art historian after casually insulting art history degrees.

- A few weeks ago, he apologized to an engaged couple for displacing their wedding so he could play golf.

Nor is it only the president who's had to say he's sorry.

- Earnest notes that Vice President Biden called to apologize to the leaders of Turkey and the United Arab Emirates for criticizing their relationship with Syria. Biden, Earnest said, "wishes that he had said it a little bit differently."

- White House adviser Dan Pfeiffer apologized to conservative columnist Charles Krauthammer in July 2012 for misrepresenting the status of a bust of Winston Churchill.

- Last fall, the first lady apologized for mispronouncing the name of Iowa Senate candidate Bruce "Bailey" Braley.