you said they would have to buy in. >> if she qualifies for medicare, she would automatically -- >> i'm fulfilling the legacy of barack obama and you're not. >> that would be a surprise to him. >> reporter: after that heated exchange, the other democrats on stage, quickly jumping in. >> this is why presidential debates are becoming unwatchable. this reminds everybody of what they cannot stand about washington. scoring points against each other, poking at each other, and telling each other that you're -- my plan -- we all -- >> that's called the democratic primary election. that's called an election. that's an election. you know? this is what we're here for. it's an election. >> a house divided cannot stand. >> we know we're on the same team here. >> reporter: many talking about beto o'rourke's vowing to confiscate weapons of war.