President Barack Obama greets Linda and Russ Dickson, a Texas couple who wrote a letter to the President about the Affordable Care Act, at the Lyndon Baines Johnson Presidential Library in Austin, Texas, April 10, 2014.

President Barack Obama greets Linda and Russ Dickson, a Texas couple who wrote a letter to the President about the Affordable Care Act, at the Lyndon Baines Johnson Presidential Library in Austin, Texas, April 10, 2014.

President Barack Obama views a replica of the Oval Office at the Lyndon Baines Johnson Presidential Library in Austin, Texas, April 10, 2014.

President Barack Obama views a replica of the Oval Office at the Lyndon Baines Johnson Presidential Library in Austin, Texas, April 10, 2014.

President Barack Obama, with Senior Advisor Valerie Jarrett and Marty Nesbitt, founding board member of The Barack Obama Foundation, listens to a recording of a President Johnson phone call during a tour of the Lyndon Baines Johnson Presidential Library in Austin, Texas, April 10, 2014.

President Barack Obama, with Senior Advisor Valerie Jarrett and Marty Nesbitt, founding board member of The Barack Obama Foundation, listens to a recording of a President Johnson phone call during a tour of the Lyndon Baines Johnson Presidential Library in Austin, Texas, April 10, 2014.

President Barack Obama tours the "Cornerstones of Civil Rights" exhibit at the Lyndon Baines Johnson Presidential Library in Austin, Texas, April 10, 2014. Mark Updegrove, Director of the LBJ Presidential Library left, leads the tour.

President Barack Obama tours the "Cornerstones of Civil Rights" exhibit at the Lyndon Baines Johnson Presidential Library in Austin, Texas, April 10, 2014. Mark Updegrove, Director of the LBJ Presidential Library left, leads the tour.

President Barack Obama bids farewell to Gen. Lloyd Austin III at Fort Bliss in El Paso, Texas, Aug. 31, 2012. The President traveled to Fort Bliss to mark the two-year anniversary of the end of America’s combat mission in Iraq.

President Barack Obama bids farewell to Gen. Lloyd Austin III at Fort Bliss in El Paso, Texas, Aug. 31, 2012. The President traveled to Fort Bliss to mark the two-year anniversary of the end of America's combat mission in Iraq.

President Barack Obama greets troops after delivering remarks at Fort Bliss in El Paso, Texas, Aug. 31, 2012. The President traveled to Fort Bliss to mark the two-year anniversary of the end of America’s combat mission in Iraq.

President Barack Obama greets troops after delivering remarks at Fort Bliss in El Paso, Texas, Aug. 31, 2012. The President traveled to Fort Bliss to mark the two-year anniversary of the end of America's combat mission in Iraq.

President Barack Obama talks with troops backstage before participating in a roundtable discussion at Fort Bliss in El Paso, Texas, Aug. 31, 2012. The President traveled to Fort Bliss to mark the two-year anniversary of the end of America’s combat mission in Iraq.

President Barack Obama talks with troops backstage before participating in a roundtable discussion at Fort Bliss in El Paso, Texas, Aug. 31, 2012. The President traveled to Fort Bliss to mark the two-year anniversary of the end of America's combat mission in Iraq.

President Barack Obama shakes hands with people in the crowd following his remarks on immigration reform at Chamizal National Memorial Park in El Paso, Texas, May 10, 2011.

President Barack Obama shakes hands with people in the crowd following his remarks on immigration reform at Chamizal National Memorial Park in El Paso, Texas, May 10, 2011.

Vice President Joe Biden and Dr. Jill Biden talk to nursing student Alicia Pearl and Dr. Booker King before visiting a patient in the burn unit at Brooke Army Medical Center in San Antonio, Texas, April 7, 2010.

Vice President Joe Biden and Dr. Jill Biden talk to nursing student Alicia Pearl and Dr. Booker King before visiting a patient in the burn unit at Brooke Army Medical Center in San Antonio, Texas, April 7, 2010.

The press pool gathers under the wing of Air Force One, prior to President Barack Obama’s departure from George Bush Intercontinental Airport, in Houston, Texas, Oct. 16, 2009.

The press pool gathers under the wing of Air Force One, prior to President Barack Obama's departure from George Bush Intercontinental Airport, in Houston, Texas, Oct. 16, 2009.