In my opinion,
Plutocracy pretty much.
Ochlocracy no.
The supremely wealthy in this country have an oversized amount of control. However, that's mostly because we let them.
You only have to look at all the efforts that go into limiting voting in this country to see that voting still works. However, efforts to keep the citizens ignorant or limit their choices has effectively made the US a plutocracy.
The mob doesn't get to have much influence now beyond what the wealthy elites are willing to allow.
There are some positive signs that American democracy isn't dead, but I'm honestly not very hopeful. The vast majority of voters just want their bread and circuses.