This is illustrative of why the Republican candidates ought to focus on tying Hillary and Bernie to Obama, and the bigger picture - things like red states are growing and blue states are shrinking, etc......instead of nit picking each other.
As Newt proved in 2011-12 (when he did it) - there’s voter gold when you attack the Dems - and all institutional liberalism - better than anyone else.
. . . which is why Donald Trump is polling so well.