Green Day‘s Billie Joe Armstrong has backed Joe Biden for victory in the US election, warning that “democracy is at stake” if Donald Trump secures a second term in the White House.Posting on Instagram, the singer shared a brief clip of the music video for 2004’s ‘American Idiot’, and warned against re-electing Trump in an accompanying caption.“It’s September 1st 2020 and I am WIDE AWAKE IN AMERICA. This has been the most unprecedented year of our lives,” Armstrong wrote.