22:26

Guardian US head of news David Taylor checks in from Sioux City at a scene which can only be described in Trumpian terms: HUGE.

After a raucous night at his University of Iowa in Iowa City, Sanders ended with a “democracy is not a spectator sport” cry from the heart, then added folk music to the equation, joking Vampire Weekend on stage for a version of This Land Is Your Land.

Dan Roberts (@RobertsDan) Whatever happens Bernie Sanders & Vampire Weekend singing This Land Is Our Land will go down as a campaign highlight pic.twitter.com/jGaarErXLA

Mercifully, he didn’t reveal any of his reggae stylings as showcased on a forgotten charity album last week.

Here’s a nice video we shot:

Vampire Weekend does This Land Is Your Land, Bernie-style.

But take a look at that crowd: