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LAS VEGAS, NV - OCTOBER 13:  Democratic presidential candidates Sen. Bernie Sanders (I-VT) (L) and Hillary Clinton take part in a presidential debate sponsored by CNN and Facebook at Wynn Las Vegas on October 13, 2015 in Las Vegas, Nevada. Five Democratic presidential candidates are participating in the party's first presidential debate.  (Photo by Joe Raedle/Getty Images)
LAS VEGAS, NV - OCTOBER 13:  Democratic presidential candidates Sen. Bernie Sanders (I-VT) (L) and Hillary Clinton take part in a presidential debate sponsored by CNN and Facebook at Wynn Las Vegas on October 13, 2015 in Las Vegas, Nevada. Five Democratic presidential candidates are participating in the party's first presidential debate.  (Photo by Joe Raedle/Getty Images)

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Sanders questions Clinton's progressive credentials

Bernie Sanders and Hillary Clinton squabbled ahead of a CNN town hall Wednesday about whether Clinton is a true progressive.

Sanders questions Clinton's progressive credentials

Bernie Sanders and Hillary Clinton squabbled ahead of a CNN town hall Wednesday about whether Clinton is a true progressive.