Margins are irrelevant in primaries since the vote in at least the last half of states avalanches to the presumed winner.

There is more to rigging elections than fucking with the vote. In a primary that spans over a month it's really easy for the media to create narratives to drive low information voters wherever the establishment wants them to go.

Even that wasn't enough to beat Sanders in 2020, so they had every establishment candidate but Biden drop out and endorse Biden right before Super Tuesday. They also had Clyburn make a surprise endorsement in South Carolina so all the black churches would direct their congregations that way.

On top of all that, Elizabeth Warren refused to drop out even though she ended campaign operations and effectively went into hiding. This is the only part of the plan that doesn't have direct evidence, but the establishment definitely got to Warren somehow, either with a stick, a carrot, or both. Warren and Bernie split the progressive vote, and yada yada yada, Trump won in 2024.

Thanks Obama