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clouds of tear gas in the streets of cairo again as police battle protesters, well take you right into the middle of the clashes, im wolf blitzer, youre in the "situation room." a day after the republican candidates sparred and cnns national security debate. mitt romney is back out there on the campaign trail. he picked up a new endorsement today in iowa. key conservatives have already held secret talks there. end of fining alternative candidate for the support. cnn joe johns is tracki...