All of the potential Democratic nominees, regardless of where they stand on the ideological spectrum, will run essentially the same campaign against Trump. Here are the biggest issues, listed in order of importance:
1. He’s a faux populist. He stacked his cabinet with billionaires, pushed for a hugely regressive tax cut, opposed changes to the minimum wage, and promoted regulatory changes that hurt working people and unions.
2. His blustery, erratic, and self-serving foreign policy has endangered our country. He sucks up to dictators, damages our alliances, invites foreign interference in our elections, ignores human rights, and needlessly drives up the cost of goods with his trade wars. Because he lies all the time, no one takes him seriously. America is now a world laughingstock (there is already great footage for a commercial here).
3. His idea of health care reform is to take insurance away from millions of Americans, and bring back pre-existing conditions.
4. Climate change is an existential problem. He views it as a Chinese hoax. The visuals of fires, hurricanes, etc. should be very compelling.
5. He’s corrupt in every possible sense of the word.
You might think that #5 should be listed first, but everyone already knows that, and his supporters discount it. The point of the campaign is to provide valuable information to people who may not be completely engaged, not to beat them over the head with stuff they already know.