Oh one more thing @CostinR... elections are a good example of showing how budgets and funding things works.
Lockheed Martin makes about $51 billion a year. But what does it do? It sells extremely high prices military equipment in low quantities. You know, "just" 100 F-35s at $80 million a piece and that sort of thing.
Apple meanwhile makes about $50 billion a quarter, largely on the back of selling many millions of little devices (computers, phones, watches) at, lets say an average of $700.
Just the same in elections, a huge number of people donating $200 or less (usually less than $50) just swamps a small number of donors giving $50,000 to $10 million in spending. The Democrat's ActBlue donor platform is world-class, and has made them more than competitive with Republicans (actually, it's given them fundraising dominance). Republicans WinRed platform is a complete shitshow and many Republican groups tell their people not to use it. Republicans are far more reliant on big donor dollars.
Trump is expected to raise that amount of money in 2020 because his wealthy donors are expected to donate on a scale never seen before. As we're seeing with Bloomberg, spending $30 million a week on advertising (while Trump raised $45 million a quarter), the billionaires out there can finance huge buys if they choose. So Trump will likely be the benefit of people like Sheldon Adelson dropping hundreds of millions into him, either through PACs or into the RNC (since the donations to Trump's campaign are limited to about $2900 per person... parties have no limits).
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For the seventeenth time, unless the left lives in vast numbers in Wisconsin, Michigan, Pennsylvania, North Carolina, Arizona and Florida, they are not the primary demographic you should be caring about in 2020. This is not a "turn out the base" election. This is a "get as many people as possible from all stripes and peel off a few in the middle".
The places I named are not hotspots of the left... not enough to make a difference. Let me put it another way, if Biden (or any candidate) can appeal to 10,000 people on the left in Wisconsin, versus 100,000 centrist independent or conservative Democrats, why on earth should he go with the smaller number? Is that logical? The point is to win elections, not to wave the ideological flag. The 10,000 should understand that rather than expect the candidate du jour to give them an appreciate handjob.
This is why Bernie is doing a lot better than Warren now by the way, compared to the tie they had a few months ago. She really stepped in it with her M4A proposal that the people in those states just do not want (so why fight it?). Bernie, while still pushing for that, has more cross over appeal. Basically while Warren is talking hard to those 10,000, Bernie has decided "you know, let's 5,000 of that 10,000 and go for 50,000 of that 100,000. It could very well net the nomination for him. Biden meanwhile is going for like 1000 of that 10,000 and 100,000 of that 100,000. That's made him stronger today than at any point since he entered the race.
But the thing you're suggesting is foolish to the extreme. It cedes the ideological center - where the voters who decide elections live - to the other side. A progressive candidate running as progressive will lose to Trump, because there are not enough progressives living in the states that mus be carried to win to offset ceding that center to Trump. It's just math.
You need to keep in mind something else: groups on the left, like those on the right, have a vested interest in pushing certain angles. The Tea Party groups "won by losing" in 2012 because they were able to channel the blame for Romney's loss into a claim that Romney playing for the center was the mistake, and what is needed instead was a candidate who was ideologically pure. I was there. I saw a lot of that shit as a Republican. Republicans only won in 2016 because Trump confounded the Tea Party approach and built crossover appeal in strategic areas. Had Ted Cruz been the nominee, the Tea Party approach would have failed (but perversely, Tea Party standing enhanced).
We're seeing that happen on the left. If Bernie wins, there are groups on the left right now that will stand to be the kingmaker. But if he is the nominee and loses in the general, like to Tea Party they'll create a fairy tale excuse and try to box out centrist Democrats for the 2024 election.
Moral of the story, ignore people who tell you to stick to the base. There is a lot of reasons that political theory came up, and a lot of is is due to how Bush won in 2004 versus Kerry giving bad formation. Also a lot of is is financial, because strongly ideological groups get more donations than closer-to-the center groups (another example of "winning even while losing".
You need to look at this as a problem of addition. You need to create a number of people to turn out on election day in about seven states... what is the most optimal route to creating the largest number. Is it ideological purity? Is it cross over appeal?
This year, the consensus is crossover appeal, because people really hate Trump and are offended by him in a way they never were even with Bush. Not going for crossover appeal this year is the death of a campaign.
Biden can beat Trump. Bernie might be able too, but the road is narrower. I don't think Warren has a prayer in hell. And it's because rather than trying to find a niche as a pragmatic progressive (like many Democrats from Massachusetts are) between Biden and Bernie, she chose to try and out compete Bernie, which was probably a mistake in retrospect.