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Republican Presidential candidate Donald Trump addresses supporters during a political rally at the Phoenix Convention Center on July 11, 2015 in Phoenix, Arizona.
Republican Presidential candidate Donald Trump addresses supporters during a political rally at the Phoenix Convention Center on July 11, 2015 in Phoenix, Arizona.

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    Donald Trump unbowed by barrage of criticism

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Donald Trump unbowed by barrage of criticism

Donald Trump surges to biggest lead yet in GOP race in new poll. CNN's Dana Bash reports.

Donald Trump unbowed by barrage of criticism

Donald Trump surges to biggest lead yet in GOP race in new poll. CNN's Dana Bash reports.