Look back at the memorable moments in State of the Union addresses through the years.
1986: Tragedy Causes Delay -- For the first time, the State of the Union address is delayed after the Space Shuttle Challenger blew up shortly after lift-off on the day the speech was scheduled.
Wisconsin Dept. of Natural Resources
Enrique Castro-Mendivil / Reuters
Gene Blevins / Reuters
Patrick T. Fallon/Reuters
Larry Downing / Reuters
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