NEW : Obama visit to the United States lasts nearly four hours . NEW : ` ` We 're tired of playing defense , '' he says . President awards `` You 're going on the offense more than 300 million Karzai . He speaks via videoconference with Purple Hearts for nearly four hours .
NEW : Obama visit to the United States lasts nearly four hours . NEW : `` We 're tired of playing defense , '' he says . President awards more than 300 million Karzai . He speaks via videoconference with Purple Hearts for nearly four hours .