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AMES, IA - JANUARY 19:   Former Alaska Gov. Sarah Palin speaks at Hansen Agriculture Student Learning Center at Iowa State University on January 19, 2016 in Ames, IA. Palin endorsed Donald Trump's run for the Republican presidential nomination.  (Photo by Aaron P. Bernstein/Getty Images)
AMES, IA - JANUARY 19:   Former Alaska Gov. Sarah Palin speaks at Hansen Agriculture Student Learning Center at Iowa State University on January 19, 2016 in Ames, IA. Palin endorsed Donald Trump's run for the Republican presidential nomination.  (Photo by Aaron P. Bernstein/Getty Images)

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    Palin denies blaming Obama for son's PTSD

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Palin denies blaming Obama for son's PTSD

Former Alaska Gov. Sarah Palin bristled on NBC's "Today" when she was asked about her recent comments linking President Obama and PTSD.

Palin denies blaming Obama for son's PTSD

Former Alaska Gov. Sarah Palin bristled on NBC's "Today" when she was asked about her recent comments linking President Obama and PTSD.