

** FILE ** In this May 21, 2012 photo, President Barack Obama speaks in Joplin, Mo. A conservative-leaning independent group is launching a $10 million television ad campaign saying President Barack Obama has not lived up to the expectations voters had for him. (AP Photo/Charlie Riedel, File)

** FILE ** In this May 21, 2012 photo, President Barack Obama speaks in Joplin, Mo. A conservative-leaning independent group is launching a $10 million television ad campaign saying President Barack Obama has not lived up to the expectations voters had for him. (AP Photo/Charlie Riedel, File)

From left, President Barack Obama, NATO Secretary General Anders Fogh Rasmussen, Afghan President Hamid Karzai, Azerbaijani President Ilham Aliyev and Pakistani President Asif Ali Zardari talk during a family picture of NATO leaders at the NATO Summit in Chicago, Monday, May 21, 2012. (AP Photo/Philippe Wojazer, Pool)

President Barack Obama speaks at a news conference at the NATO Summit in Chicago, Monday, May 21, 2012. (AP Photo/Kiichiro Sato)

From left, President Barack Obama, NATO Secretary General Anders Fogh Rasmussen, Afghan President Hamid Karzai, Azerbaijani President Ilham Aliyev and Pakistani President Asif Ali Zardari talk during a family picture of NATO leaders at the NATO Summit in Chicago, Monday, May 21, 2012. (AP Photo/Philippe Wojazer, Pool)

President Barack Obama speaks at a fundraising event Thursday, May 10, 2012, in Seattle. (AP Photo/Elaine Thompson)

President Barack Obama kisses German Chancellor Angela Merkel on the cheek on arrival for the G-8 Summit Friday, May 18, 2012, at Camp David, Md. (AP Photo/Charles Dharapak)

President Barack Obama kisses German Chancellor Angela Merkel on the cheek on arrival for the G-8 Summit Friday, May 18, 2012, at Camp David, Md. (AP Photo/Charles Dharapak)

Margaret Nelson, center, from Evanston, Ill., joins about 100 anti-war activists as they march down Michigan Avenue after rallying outside President Barack Obama's campaign headquarters in downtown Chicago, protesting for an end to NATO operations in Afghanistan, Thursday, May 17, 2012, in Chicago. (AP Photo/Charles Rex Arbogast)