Warning, serious electoral geekery ahead with work shown. tl;dr - Sanders has radically out performed in the last 6 of 7 races that he has won. This is notable, and newsworthy and the narrative absolutely needs to reflect that.
Diving in: Sanders has outperformed 538 goals by 125% and Clinton underperformed at 66%, the more CW Cook's report is 126% overperform and 66.5% underperform for Clinton. Keep in mind that is of the respective number crunchers reports.
Sanders won 189 delegates over her 97. Which doesn't take a math expert to note that is TWICE what she has gotten. Keep in mind, this is INCLUSIVE of Arizona
Now: Many Clinton supporters seemed to be determined to not even acknowledge that Sanders won 6 out of the last 7 contests and thus far the news seems to be "Sanders is out of caucuses". It's unbelievable to me! Wait, it is totally believable. We're talking about the same race that the networks spent at least half of talking about the latest schoolyard taunts the Republicans are on about while results were coming in. Sheesh. Good news for Sanders is only ever reflected in how it affects Clinton. Well, ok. That's how you know you've got them against you from the start. But with that frame, let's examine why... but also give Bernie his due.
I've had the privilege for working for a few campaigns over the years, and if I were a Sanders campaign insider I'd be lighting up the sky about this. It isn't just about acknowledging victory it's about creating a narrative... and frankly, creating airspace in a cycle utterly obsessed with the Republican race. Of course, "working the ref" is considered a loser move. hahahaha.
So what we hear about Clinton's running mate possibilities and when Bernie will drop out. WE ARE PICKING UP GROUND, NOT LOSING! Momentum is a media narrative, so in times like this... you must (as Jello says) Become the Media.
Anyway, I busted ass to put this amateur hour model together to prove my point. If you are into it, feel free to share it.