Tuesday’s Democratic debate is a battle for heads, not hearts

The dynamics of the Democratic presidential race are about to change. Tuesday’s debate in Des Moines will be the grand opening of a new set of conflicts and the launch of renewed efforts by candidates not named Joe Biden or Bernie Sanders to make 2020 something other than a lightly remodeled version of the 2016 primaries. CONT.

E.J. Dionne Jr., Washington Post