 CBS's Taran Small. Hours after their first debate face-off, President Joe Biden and Donald Trump are back on the trail with the president conceding his poor debate performance, leaving Trump's many falsehoods unchecked and leaving Democrats rattled with some calling for him to drop out of the race. Mr. Biden and those close to him say that's not happening. Iran's government says there was just a 40% turnout for their presidential election and now there's going to be a runoff. CBS's Elizabeth Palmer is in Tehran.