He also clarified his future involvement with the New York band
Droste compared the Democratic politician to "candy"
The Vampire Weekend member created the song in less than three minutes
Band performs "Cape Cod Kwassa Kwassa", "Unbelievers", "Rise Above" and "A-Punk"
It will be Grizzly Bear's first performance in over two years
Ezra Koenig "refused to capitalize on Weezer's misfortune."
Rostam is joined by a pair of YouTube dancers in the accompanying video
Bassist discusses band's next release
The Democratic candidate tied with Hillary Clinton at the Iowa Caucus earlier this week (February 1)
Koenig appeared at a Sanders rally in Iowa City on Saturday