us. i m don lemon in tampa, florida, where preparations are under way right now for monday s cnn tea party republican debate. we begin with the tenth anniversary of 9/11. in the arms of the angels the nation, if not the entire world, pauses to mourn the nearly 3,000 people who lost their lives ten years ago on the morning of september 11th. former presidents bush and clinton were in shanksville, pennsylvania, just this afternoon to dedicate a memorial to the heroic passengers of united airlines flight 93. their sacrifice on that extraordinary day, no doubt saved countless other lives. president obama has declared this weekend national days of prayer and remembrance. he and the first lady spent some time today at arlington national cemetery. they visited a section where service members killed in iraq and afghanistan are buried. just a short distance away at the pentagon, former president bush and his wife laid a wreath of flowers at a site known as the 9/11 stone. 184 peop