Here is NPR’s Domenico Montanaro on Bernie’s triumph:
Regardless of what happens, when people look back on this 2016 Democratic primary, Sanders won't be dismissed as a gadfly or fringe candidate, as he was treated at the beginning of this campaign. He has already had a major impact on the Democratic Party, on Hillary Clinton and how they talk about the issues he's cared about most for the last 40 years — income inequality, regulation of Wall Street banks and power and influence in politics.
But he doesn’t stop there. He goes on to lay out a possible path for Bernie to win a majority of pledged delegates.
In a nutshell: Bernie’s stunning clean sweep yesterday improved his chances, but he still needs to win 57% of the remaining available pledged delegates to just squeak by with a majority (this is down from around 60% immediately after the 3/15 primaries).
He concludes:
What Sanders has done not only likely guarantees him a prominent slot at the convention, but ensures his message, and the issues he cares about deeply, a place at the Democratic table.
Sanders is going to fight on to June, but even if he doesn't pull off the majorities he needs, in a way, he's already won.
I’ve lived in Vermont for thirty years (not long enough to say I’m a Vermonter, by local standards) and have supported him starting with his first run for Congress in 1990. In this primary, Bernie has continued to do what he’s been doing his entire political career: confound conventional wisdom. So if anyone can pull this off, it’s Bernie.
But no matter what happens, he has sparked a democratic movement — big “D” and small “d”-- that will benefit the party and the country.