They'd probably be better off by doing so. After the 1968 primary, the Democratic Party made a number of changes to how they hold primaries, mainly in order to

They'd probably be better off by doing so. After the 1968 primary, the Democratic Party made a number of changes to how they hold primaries, mainly in order to avoid a split between the conservative and progressive wings of the party. But the 2016 and 2020 primaries were so visibly rigged that they may well have done worse in that respect than simply choosing Clinton and Biden in a smoke-filled room would have done.