 BBC World Service, it's 10 o'clock GMT. This is Oliver Conway with the newsroom. Iran's presidential election will go to a runoff on Friday with the sole moderate candidate taking on an ultra-conservative. After a bad TV debate, will Joe Biden step down as the Democratic presidential candidate? There's no sugarcoating it. He had a bad performance. But when you stumble, you get back up. The question is, can he still lead this country? And we believe that he can.