Joe Biden is not a "moderate" when it comes to crime issues. His hard-line authoritarian record speaks for itself, runs out of breath, and then speaks for itself some more....
I can only assume this profound mischaracterization of Biden's record was arrived at through the tired assumption that democrats are "soft" on crime, republicans are "tough," and therefore "moderates" are democrats who support harsh laws. Joe Biden is exactly the reason such stereotypes should be avoided by responsible journalists.
Perhaps they felt he'd appeal to Clinton supporters.