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Republican presidential hopeful  Ben Carson speaks during the Republican presidential debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015.  Republican presidential frontrunner Donald Trump stepped into a campaign hornet's nest as his rivals collectively turned their sights on the billionaire in the party's second debate of the 2016 presidential race.  AFP PHOTO / FREDERIC J. BROWN        (Photo credit should read FREDERIC J BROWN/AFP/Getty Images)
Republican presidential hopeful  Ben Carson speaks during the Republican presidential debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015.  Republican presidential frontrunner Donald Trump stepped into a campaign hornet's nest as his rivals collectively turned their sights on the billionaire in the party's second debate of the 2016 presidential race.  AFP PHOTO / FREDERIC J. BROWN        (Photo credit should read FREDERIC J BROWN/AFP/Getty Images)

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    Ben Carson struggles to explain debt limit stance

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Ben Carson struggles to explain debt limit stance

Presidential candidate Ben Carson struggled in an interview to explain whether he would support increasing the debt ceiling.

Ben Carson struggles to explain debt limit stance

Presidential candidate Ben Carson struggled in an interview to explain whether he would support increasing the debt ceiling.