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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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Donna Brazile joins "At This Hour" to share her thoughts on Sarah Palin linking her son's domestic violence arrest to President Obama