I don't understand what voters Trump could've picked up between 2016 and 2020

Maybe Democrats aren’t viewed as aligned with corporate interests, but that doesn’t mean that’s the reality. I believe both parties are. But Trump at least claimed to be moving away from that, and several of his key policies were different to standard Republican ones. Weren’t they big supporters of free trade before Trump, for example? I think this was part of Trump’s appeal and something Democrats could look at emulating. The idea, if not specific policies.

This excerpt GreenWyvern posted in another thread is along the lines of what I am thinking, although I haven’t had chance to read the whole article yet:

The big problem with this is that the legislation that would be best for eg Microsoft may be very different from the legislation that would be best for Microsoft’s customers. But the former has all the money and lobbyists dedicated to getting it’s way, so the latter lose out. I don’t know how it is in the USA, but in the UK it often happens that a minister will make some decision that benefits a certain company, then when he retires from politics, he gets a very well paid position on the board of that company. Ordinary taxpayers are the ones who lose out.