I haven't watched the debate last night, and don't really plan to read much about it, other than this short summary, which was a good read with lessons beyond the debate itself, on how to deal with narcissists.
"But if foreign leaders could figure out how to manipulate Trump’s self-absorption, so too could his domestic opposition."
https://www.vox.com/politics/370942/harris-trump-debate-who-won-bait-kamala-donald