Edit: source
https://www.cnbc.com/2019/05/20/cramer-bidens-2020-bid-is-se...
https://www.healthsystemtracker.org/chart-collection/u-s-spe...
Spending and costs are distinct, of course, but they're related, and you'll see spending track costs directly unless there's a factor that increases/decreases demand for services
What do we see? An acceleration bump in 2014/2015, and then it settles back into data whose variation is much like pre-ACA dynamics. 2014 would have been when the exchanges and wide reach of access went into effect. The spending acceleration bump was almost certainly people who didn't have access before using medical services.
The idea that the ACA drove some kind of unprecedented increase in costs doesn't track:
https://www.thebalance.com/causes-of-rising-healthcare-costs...
And lots of stocks rose when Biden was nominated (and elected). Sensible leadership prospects have their own positive effect on enterprise.