The National are set to open up a Democratic campaign rally for incumbent US President Barack Obama.

The event will take place this Saturday (September 1) in Des Moines, Iowa. The Brooklyn based indie band announced the news on Twitter, writing: “Proud to support Barack Obama again in 2012. We’ll be opening for him in Des Moines on Sept 1. ”

The band previously played at an Obama rally in 2010. This show marks one of only two appearances for The National for the rest of 2012, the other being a headline appearance at their own All Tomorrow’s Parties event in December in the UK.

The three-day festival will return to its original venue, Pontins in Camber Sands, after Butlins in Minehead ended its contract with the festival. The National will host the event on December 7-9.

The line-up also includes Kronos Quartet, The Antlers, Owen Pallett, Boris, Tim Hecker, Sharon Van Etten, My Brightest Diamond, Wye Oak, Lower Dens, Megafaun, Suuns, Local Natives, Kurt Vile & The Violators, Michael Rother presents the music of Neu! & Harmonia, Deerhoof, Menomena, Nico Muhly, Stars Of The Lid, Youth Lagoon, Perfume Genius, Bear In Heaven, Richard Reed Parry (Arcade Fire), Mark Mulcahy (Miracle Legion), Kathleen Edwards, Hauschka, This Is The Kit, So Percussion and Hayden.

For a full line-up and more information see ATPfestival.com.