whitaker, cbs news, mexico city. >> glor: president obama marked independence day by calling for immigration reform. at the white house, mr. obama attended a swearing-in ceremony for 25 naturalized citizens. all u.s. service members. immigration, the president said, makes america stronger. >> as another step forward, we're lifting the shadow of deportation from deserving young people who were brought to this country as children. it's why we still need a dream act to keep talented young people who want to contribute to our society, serve our country. it's why we need-- why america's success demands-- comprehensive immigration reform. >> glor: this evening, the president hosted a picnic at the white house for military families. another innocent victim in the scourge of violence in chicago. we're on the ground with u.s. soldiers in afghanistan in one of the last major offenses against the taliban. and for the first time, an amputee will run at the olympics when the "cbs evening news" >> glor: this july 4 is the 11th americans have spent fighting in afghanistan. but even as we get closer to the deadline for withdrawal, the wo