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milestone, the 50th anniversary of martin luter king's "i have a dream" speech. the words belonged to the ages. >> unmatched in our time. >> reporter: it was one of the only few public appearances for the president, who has little time to spend away from the white house. any decision to strike syria over the alleged use of chemical weapons is growing more complicated by the day. over at the u.n., syria's ambassador sounded the alarm and accused rebels of launching their own gas attacks. >> we are in a state of war, preparing for the worst scenario. >> accusing russia of blocking u.n. action. >> we cannot be held up in responding by russia's continued intrance jens at the united nations. >> the british may require the u.n. to present its evidence.