We need someone who will energize the left the same way Trump energizes the right.
Biden is not that someone.
Energize the left only works to get rid of Trump if low turnout was the cause of the defeat. Otherwise, you're asking for blood from a stone
https://www.nytimes.com/2017/03/28/upshot/a-2016-review-turnout-wasnt-the-driver-of-clintons-defeat.htmlEDIT: opinion polls consistently show that over 40% of America call themselves "conservative" whereas only about ~22% call themselves "liberal". Stuff that only appeals to a
subset of liberals, such as radical left stuff, isn't the "energizing the base" stuff you're looking for.
Hardcore leftists are going to hate their own party no matter what, because to actually win, you need to broaden that base
beyond people who consider themselves "liberal", so you'll inevitably have stuff on your platform that pisses off the rad left, meaning if they're not turning out to vote for you now, they never will. You just cannot simply mirror what a Republican is doing, strategy-wise, because you don't have the numbers of hardcore believers available to make that work.
My view is that if you
really want to win, you need to have something the swing vote wants. The key point here, is that is
doesn't have to be what Trump's offering them. But it has to be
something and not
nothing. See what the top three things that concern the swing vote are, then pick some of those and find things the Democrats can offer them, and - critically - work it into language that isn't going to be a turn-off. That "firing up the base" far left language won't cut it. It's appealing to statistically 10% of the nation, who are either turning up already or not going to bother.