Copying and pasting my own comment from another thread:
If you want leftists to vote for dems, despite dems pissing on leftists at every possible chance and yelling at leftists to fall in line, I'll show you how.
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Point out that voting will never, ever, ever move the democrat party to the left. You cannot vote the party harder to the left.
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Point out that Republicans are going to remain fascists.
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Point out that voting third party is a spoiler vote and will result in fascists winning.
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Point out that the actual way to move to the left is to unionize and organize at the grassroots level, to apply bottom-up pressure on the top.
The answer is not to pretend that Biden is anything other than a Neoliberal Capitalist. Leftists will correctly point out that Biden is still a lukewarm neoliberal maintaining the status quo, and feel further alienated by being told they should love him anyways. That just encourages voter apathy.
Additionally, this meme is wrong. Leftists voted, it was the centrists and moderates that didn't. Hillary wasn't appealing in any way, so only the people who really cared voted. Hillary still won the popular vote, she just lost the electoral college, and Trump succeeded in riling up the fascist base. Do not blame Leftists for not falling in line for an extremely unlikable candidate, they did regardless. Blame Hillary for doing jack-shit to energize the base.