Sounds like a very important election.
Democrats should probably run someone not alienating constituents whose vote he relies on.
They should also probably run someone who doesn’t make everyone who watches that debate start thinking “mabie we need to 25th amendment this guy”.
https://www.theguardian.com/commentisfree/2016/nov/04/if-donald-trump-wins-new-age-endarkenment
https://www.politico.com/magazine/story/2016/10/trump-american-democracy-could-break-down-214383/
https://www.nytimes.com/2016/10/21/us/politics/campaign-election-trump-clinton.html
https://nymag.com/intelligencer/2016/04/america-tyranny-donald-trump.html
https://www.nytimes.com/2016/11/01/opinion/how-you-can-fight-donald-trump-right-now.html
https://www.bostonglobe.com/opinion/2016/04/09/etrump/JPOQJZK9hUBdBx5rdPkWFK/story.html