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WICHITA, KS - MARCH 5:  Republican presidential candidate Donald Trump makes a speech at a campaign rally on March 5, 2016 in Wichita, Kansas. The Republican party was holding its state wide caucus in several locations. (Photo by J Pat Carter/Getty Images)
WICHITA, KS - MARCH 5:  Republican presidential candidate Donald Trump makes a speech at a campaign rally on March 5, 2016 in Wichita, Kansas. The Republican party was holding its state wide caucus in several locations. (Photo by J Pat Carter/Getty Images)

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    Poll: Trump's national lead tightens

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Poll: Trump's national lead tightens

CNN's Sara Murray reports.

Poll: Trump's national lead tightens

CNN's Sara Murray reports.