Why We Should Sing The Star-Spangled Banner's Obscure Fifth Verse

This week marks 86 years since the Star Spangled Banner officially became the national anthem. It was written much earlier, though, in 1814, and you can probably sing along to those four original verses. But you may not know there's also one unofficial verse, written much later. KQED senior arts editor Chloe Veltman met a history professor from Los Angeles who thinks this obscure stanza is the one we should all be singing today, because it laments a divided country, one in which Americans turn against each other.