US Vice President Joe Biden (L) speaks during the vice presidential debate with Republican vice presidential candidate Paul Ryan at Centre College in Danville, Kentucky, on October 11. Biden and Ryan ... more 

US Vice President Joe Biden (L) speaks during the vice presidential debate with Republican vice presidential candidate Paul Ryan at Centre College in Danville, Kentucky, on October 11. Biden and Ryan clashed over Iran and the death of the US ambassador to Libya Thursday, as a heated row over foreign affairs consumed early stages of their debate less