Vampire Weekend's Ezra Koenig has been a vocal supporter of Democratic presidential candidate Bernie Sanders, playing at rallies in New York and Iowa, and talking about him on CNN and Beats 1. But he's very frustrated with the voting process in his home state. In a note on his Twitter, Koenig calls the New York primary election "bullshit." New York holds closed primaries, meaning only voters registered with a specific party can vote in that party's primary. New York is holding both Democratic and Republican primaries tomorrow, April 19. But the deadline to switch parties was back on October 9. That means that if you were previously registered as a Republican or independent, and hadn't switched to being registered as a Democrat by October 9, you can't vote for Sanders or Hillary Clinton tomorrow in New York State. (New voters had until March 25 to register as a Democrat.) Update (4/19, 5:04 p.m. EST): Cat Power has also aired her frustrations with New York's "corrupt" voter system. "More than 126,000 Bernie voters in New York are certainly pissed off today & SO AM I," she wrote. Find her post below.

Koenig wrote, "I can't say whether this will fundamentally alter the results of the primary tomorrow but I have a feeling it will. Either way, this isn't democracy." In another tweet, Koenig called on New York Mayor Bill de Blasio to speak on the issue, or else risk reaching "the number one spot on my enemies list." See Koenig's Tweets below.

Update (4/20, 10:32 a.m. EST): Koenig has posted more Tweets addressing the issue in the wake of yesterday's primary. In addition to criticizing journalists for "dismissing voter suppression," he gave a shout-out to Clinton's New York supporters. Scroll down to read his latest thoughts.

Watch Vampire Weekend on Pitchfork.tv's "Over/Under":