No- even if "leftists" within the Democratic party were united, they still would've lost to Biden, because they're outnumbered by "moderates/pragmatists". From last March:
I think it’s time for the left-wing Berniecrats to acknowledge that they overestimated themselves.In 2016, the ratio of Hillary Clinton’s vote share relative to Sanders’ was about 5–4, which suggests that over half of Democratic voters (who vote in primaries) identify more with “moderate” Democrats than with more left-wing Democrats.
Now that the field has been reduced to a showdown between left and center, with all the other candidates dropping out and picking sides, the same 5–4 ratio is starting to show.
You could still trace out the 5–4 ratio when other candidates were still running; if you added up the poll numbers of all the non-leftist Democrats (Biden, Buttigieg, Klobuchar, Bloomberg, et al.), you got a vote share that more or less resembles what Biden has now (more than 50%),
whereas if you added up the poll numbers of the more left-wing candidates (Sanders, Warren, Yang) you ended up with a vote share of more than 40% but no more than 50%.
The leftists need to be honest with themselves — they do not have the upper hand in the politics of this country, and the policies they want implemented are not going to happen right away, and certainly not without resistance. The changes they dream of are just going to have to wait.
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