I’m not sure what Obama turned around? Are you referring to quantitative easing (Printing Money) which was brought on by Ben Bernanke of the Federal Reserve? That has zero to do with Obama, just like watching Trump freak out that the Fed keeps raising interest rates. I think people on both sides tend to give Presidents way to much credit for the economy.

Presidents shouldn’t but often start wars before congress votes on them which can effect the economy, they also have broad power in trade, as we can see in tariffs. One can argue which presidents trade platform benefits America the most but Obama didn’t save the economy, anymore than Trump did.