The indie-pop band fun. will donate the proceeds from an Oct. 31 concert in Portland to Mainers United for Marriage, the campaign announced today.

The concert is set for the State Theatre and comes on the heels of a 16-country European tour.

“This is a huge and historic moment for Maine in which the citizens of Maine have the power to go vote and take matters into their own hands to win the freedom to marry,” said band member Jack Antonoff in a statement released by the campaign. “We hope to see a big crowd at the show and we’re thrilled to be part of the campaign.”

Matt McTighe, campaign manager for Mainers United, said the concert comes just six days before the election and will remind the younger demographic to vote.

“We’re grateful for fun.’s support and for their enthusiasm and commitment to winning the freedom to marry,” he said.

Here’s a YouTube link to one of fun.’s hits, “We are Young.”

The song topped the Hot 100 Airplay chart with 120 million impressions in seven weeks, making it one of the more popular songs in recent years.