90% of US media is not aligned with the Democrats and as such they do not possess the same power to manufacture outrage as the Republicans do.
The media works for the same people both parties do. If capital wanted to manufacture Democrat-aligned outrage they could easily do so overnight.
But it's a complete mistake to think about politics in a partisan manner at all. Of course the democrats won't ever fight for you. Doing anything decreases chances of getting elected again.
Whatever force will depose capital won't come from the two-party system.
Fewer outlets serving larger populations means stricter control over messaging, and a better propaganda base.