Press Secretary Jay Carney works backstage as President Barack Obama attends a dinner at the Artists for Humanity EpiCenter in Boston, Mass., March 5, 2014.

Press Secretary Jay Carney works backstage as President Barack Obama attends a dinner at the Artists for Humanity EpiCenter in Boston, Mass., March 5, 2014.

Oct. 30, 2013 "The President hugs former Boston Celtics Hall of Fame basketball player Bill Russell during a stop to view the statue of Russell before its unveiling at City Hall Plaza in Boston." (Official White House Photo by Pete Souza) This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.

Oct. 30, 2013
"The President hugs former Boston Celtics Hall of Fame basketball player Bill Russell during a stop to view the statue of Russell before its unveiling at City Hall Plaza in Boston." 
(Official White House Photo by Pete Souza)

This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.

President Barack Obama and Members of Congress are met by Gov. Deval Patrick and Boston Mayor Thomas Menino upon arrival at Logan International Airport in Boston, Mass., Oct. 30, 2013.

President Barack Obama and Members of Congress are met by Gov. Deval Patrick and Boston Mayor Thomas Menino upon arrival at Logan International Airport in Boston, Mass., Oct. 30, 2013.

President Barack Obama talks with staff at Massachusetts General Hospital in Boston, Mass., April 18, 2013. The President visited the hospital to meet with patients who were wounded in the bombings in Boston, following an interfaith prayer service at the Cathedral of the Holy Cross.

President Barack Obama talks with staff at Massachusetts General Hospital in Boston, Mass., April 18, 2013. The President visited the hospital to meet with patients who were wounded in the bombings in Boston, following an interfaith prayer service at the Cathedral of the Holy Cross.

President Barack Obama talks with Tom Grilk, head of the Boston Athletic Association, as he greets first responders and marathon volunteers at Cathedral High School in Boston, Mass., April 18, 2013. The President and First Lady Michelle Obama traveled to Boston to attend an interfaith prayer service dedicated to the victims of the Boston Marathon bombings.

President Barack Obama talks with Tom Grilk, head of the Boston Athletic Association, as he greets first responders and marathon volunteers at Cathedral High School in Boston, Mass., April 18, 2013. The President and First Lady Michelle Obama traveled to Boston to attend an interfaith prayer service dedicated to the victims of the Boston Marathon bombings.

President Barack Obama delivers remarks during an interfaith prayer service dedicated to the victims of the Boston Marathon bombings, at the Cathedral of the Holy Cross in Boston, Mass., April 18, 2013.

President Barack Obama delivers remarks during an interfaith prayer service dedicated to the victims of the Boston Marathon bombings, at the Cathedral of the Holy Cross in Boston, Mass., April 18, 2013.

President Barack Obama and First Lady Michelle Obama attend an interfaith prayer service dedicated to the victims of the Boston Marathon bombings, at the Cathedral of the Holy Cross in Boston, Mass., April 18, 2013. Massachusetts Governor Deval Patrick is seated at right.

President Barack Obama and First Lady Michelle Obama attend an interfaith prayer service dedicated to the victims of the Boston Marathon bombings, at the Cathedral of the Holy Cross in Boston, Mass., April 18, 2013. Massachusetts Governor Deval Patrick is seated at right.

President Barack Obama waves to the audience after delivering remarks at Symphony Hall in Boston, Mass., June 25, 2012.

President Barack Obama waves to the audience after delivering remarks at Symphony Hall in Boston, Mass., June 25, 2012.

President Barack Obama hugs Vicki Kennedy as he touches the coffin of her husband, Senator Edward Kennedy during his funeral at Our Lady of Perpetual Help Basilica in Boston, Aug. 29, 2009.

President Barack Obama hugs Vicki Kennedy as he touches the coffin of her husband, Senator Edward Kennedy during his funeral at Our Lady of Perpetual Help Basilica in Boston, Aug. 29, 2009.

President Barack Obama hugs Rep. Patrick Kennedy during the funeral of his father, Senator Edward Kennedy, in Our Lady of Perpetual Help Basilica in Boston, Aug. 29, 2009.

President Barack Obama hugs Rep. Patrick Kennedy during the funeral of his father, Senator Edward Kennedy, in Our Lady of Perpetual Help Basilica in Boston, Aug. 29, 2009.