i expect harris has been holed up studying and prepping like it's her second run at the bar. conversely i suspect trump has done next to nothing.
as a result harris will come across as very rehearsed, champing at the bit for an opportunity to use her canned attacks, while lying through her teeth about defunding, bail projects, open borders, fracking, inflation, her voting record, and on and on. and the media will declare her a star.
trump will answer with hyperbole, sort of right, sort of wrong, miss one opportunity after another to pin her down instead focusing on things that don't matter while rambling into non sequiturs that are effectively nonresponsive. lastly he'll make an off color sophomoric remark that will be replayed as the feature of his debate.
as univee said no winners. we all lose. The media has already declared Harris the winner