May 31, 2010: “The skies opened up on Memorial Day outside of Chicago. When the lightning began, the Secret Service told the President that it was too dangerous to proceed. He took the stage by himself and informed the audience that his speech was canceled and that for everyone’s safety, they should return to their busses. Later, he boarded a few of the busses to thank them for attending and apologized for not being able to speak.” (Official White House Photo by Pete Souza)
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