And right there in your link text is the opening for Dems to remind people that it was liberal policies that built an economy that actually grew for the middle class and not just the elites.
If economy is truly the #1 thing on the persuadable folks minds, you have to lean in, you have to make your case. Then, if you want another term, you have do deliver.
The Right has had yet another shot at showing us that laissez-faire tendencies are the rising tide that lifts all boats, and have, once again proven their thesis WRONG. I think the persuadables are correct. The economy isn't working for the bottom 4 quartiles. We are badly in need of a course correction.
I doubt you can sell social democracy in 90 days, but you can sell individual policies to strengthen worker protections and benefits.
Elections are about giving things to people. Trump is giving his wealthy donors lower taxes and less regulation, and to his poorer cult followers, he's giving them increased self-worth by elevating them above brown people. Make this election about shifting subsidies away from the top 1% and towards the other 99%, and fulfilling the promise that we consider all people equal. Own the economy as an issue. But understand that the reason it is an issue is it is very much not growing for most people.