It's actually a pretty standard and old political pattern.  People running for election tear each other down until there is no front runner and voters are looking for something to rally behind.  Then in shows up a savior that has been saying "I'm not running for president" for months. So Bernie is in the way of Hillary getting her turn by showing up last minute to save the democrats from Trump.  And it's likely that Pete Buttsex or Biden is the VP for Hillary.  And if Bernie actually wins the primary, then Hillary will be the mandatory VP and Bernie will get impeached by the Democratic majority for being a Russian asset (Mueller report turned up that Russia supported him).