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The rules of the Democratic party make it almost impossible to replace Biden atop the ticket unless he voluntarily steps aside. Biden currently has 3,894 of the nearly 4,000 estimated pledged delegates so far, most of whom are required to stick with him through the first round of voting, which will be held virtually online ahead of the Democratic National Convention. Some 25% of delegates at the convention would be needed to hold a vote opening the way to another candidate’s chance to be the nominee. That remains very unlikely.