Trump v Bloomberg will provide economic stimulus in its own right. Advertising.I think the Democrat strategy is to reveal how Trump has been behaving like a Mafia don in the hope that more moderate Republican voters will not support him in 2020.You do wonder what wrongdoing or crime it would take for him to lose that support. For Trump's base he can do no wrong and many moderate Republicans benefit from their vote.
This may or may not work given the extent of bitterness in the US political divide.
This is not just a US phenomena as politics globally is becoming more polarised than ever. Maybe a Bloomberg vs Trump battle of the $$$ is just what the election needs.
Jobs, jobs, jobs.