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Democrats have a unique way of allocating delegates in each state and because of that we should all expect a long and grueling primary season that likely won't be over quickly. However, this isn't necessarily a bad thing because it (hopefully) weeds out the weakest candidates and forces the stronger candidates to make their case to more than a handful of states.
The Democratic Party's rules mandate that delegates, the people chosen to go to the national convention and officially nominate the candidate for President on the Democratic ticket, must be doled out proportionally based off the percentage of votes each candidate wins (so long as they reach what is called the 15% threshold). So a candidate can "win" a primary with 35% of the vote, but instead of getting 100% of the delegates (as they would in many Republican primaries), they will only get 35% of the delegates.
This type of delegate allocation also dilutes the power of "big" states like California, New York, and Texas because, while they have more delegates, they will be divvied up proportionally in the same way as every other state. That will only wind up hurting lesser known candidates because it makes it more difficult to focus on one big state that they can use as a springboard.
Many lesser known candidates will undoubtedly drop out of the race, but don't be surprised if Biden, Warren, Sanders, and one or two more go deep into the primary season. The rules virtually guarantee that they will.