Alright, thanks for the good-faith response. You're correct, your belief in Capitalism being a useful tool that needs to be harnessed and contained, over actually needing to transition to a Worker-owned economy, is what separates what I am referring to as leftists and yourself. You can consider yourself a leftist, but I would probably classify you as a liberal or a Social Democrat (probably closer to a SocDem than a liberal, which is essentially a centrist).
The fundamental difference here is that leftists (as I am referring to, and will further refer as italicized to save time) have analyzed Capitalism and believe it to be fundamentally unsalvageable, only band-aids and stop-gaps to slow the fundamental issues like The Tendency for the Rate of Profit to Fall, or fundamental exploitation.
Your viewpoint is extremely common among Social Democrats, and that aligns very well with the Bernie Sanders campaign. Definitely far more preferable than liberalism, but it's also important to realize that leftists consider Bernie to be a compromise at best, and not an actual restructuring of the economy.
What you analyze as money corrupting in politics being the root cause of issues, leftists would also point to rising disparity even in Social Democracies like the Nordic Countries. It's slower there thanks to Worker Empowerment via strong unions, but still continues to rise. You agree with leftists that money in politics is bad, but you seem to believe this is a policy issue, and not a fundamental consequence of Capitalism, which is what leftists tend to believe.
Is this a fair explanation? If we look at your view of liberalism and Capitalism in general, we can see that, yes, Biden is more in line with what you want than what leftists want. For you, Biden is more of a question of competency, than direction, whereas for leftists, the direction itself is bad.
Do you see what I've been saying now?