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NEW YORK, NY - SEPTEMBER 03:  GOP presidential front-runner Donald Trump speaks at a news conference in Manhattan after he signed a pledge Thursday to support the Republican nominee in the 2016 general election, ruling out a third-party or independent run on September 3, 2015 in New York City. Trump made the announcement following a meeting with  Republican National Committee chairman Reince Priebus. Trump stressed repeatedly in the news conference that he is leading in all national polls.  (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - SEPTEMBER 03:  GOP presidential front-runner Donald Trump speaks at a news conference in Manhattan after he signed a pledge Thursday to support the Republican nominee in the 2016 general election, ruling out a third-party or independent run on September 3, 2015 in New York City. Trump made the announcement following a meeting with  Republican National Committee chairman Reince Priebus. Trump stressed repeatedly in the news conference that he is leading in all national polls.  (Photo by Spencer Platt/Getty Images)

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Both parties' front-runners Donald Trump and Hillary Clinton are coping with stumbles of their own making. CNN's Suzanne Malveaux reports.