I have been very unhappy with the volume of attacks, but there is a reason in Newt's case to question the authenticity or persistence of his policy preferences. He has a long record as a rather mercurial fan of various causes and has shown that he is willing to violate his most solemn commitments in service to his ambition of the moment. Such behavior begs for questioning, although it is unlikely to yield a satisfactory answer.
All these candidates have weaknesses. That's just how things are. Best we focus upon differences in the solutions they propose.