That's why, when the president addresses the nation next Tuesday night in his State of the Union address, top aides say it will build on the president's highly successful speech at the University of Arizona memorial service after the Tucson tragedy.

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Alas, as Jeffrey Lacasse of Arizona State University and Jonathan Leo of Lincoln Memorial University pointed out in a letter published in JAMA last October, Dr Robinson failed to clarify that important point in his paper.

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The White House has announced that President Barack Obama will attend a memorial service on Wednesday evening at a basketball arena in Arizona.

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President Barack Obama and his wife, Michelle Obama, will attend a Wednesday memorial service and visit with victims' families at the University of Arizona in Tucson, according to a statement from the school.

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