The far left is failing because the wealthy have undue influence. Period.
Most people want more for their tax dollars, want the wealthy to pay their share, want a safety net that’s at least comparable to what Europeans get (or used to get until they started emulating us.)
Indeed, there is no radical left. The leader of the radical left, Bernie Sanders, has been the key factor is getting Biden’s most ambitious legislation passed.
The so-called moderates have been blocking Biden.