(CNN) Democratic candidates for president took part in their party’s seventh debate on Tuesday night in Des Moines and CNN commentators weighed in. The opinions expressed in these commentaries are those of the authors Paul Begala: Pulled punches, no knockouts Paul Begala The dystopian show “The Man in the High Castle” depicts two parallel universes: one in which the Germans and Japanese won World War II, and one where the Allies did. The main characters bounce between these two polar opposite realities. The effect can be dizzying, and yet also clarifying. Tonight’s Democratic debate showed leadership as opposite from Donald Trump as those two fictionalized worlds. Where Trump is corrupt, the Democrats spoke of reform. Where Trump is self-centered, Democrats dared to care for kids and the poor and the working class. Where Trump is a bully, Democrats were empathetic. Where Trump is a serial liar, the Democrats stuck to the facts. Read More I think Democrats, especially in Iowa, will love it. Iowans, God love ’em, hate negative campaigning. That’s why negative ads in the 2020 Democratic Caucus campaign are about as common as synchronized swimmers in a Sioux County cornfield. Perhaps that’s why, in the all-important first half-hour…