NASHVILLE, Tenn. – After a raucous first debate led organizers to introduce a mute button, the second and final meeting between President Donald Trump and Democratic challenger Joe Biden was a downright civil affair.Whether because of that button this time or the terrible reviews in the first debate — especially for Trump — the candidates interrupted each other far less frequently Thursday night, even as they clashed on issues including the coronavirus, crime and global warming.While Trump and Biden responded to the other's answers — shaking their heads disapprovingly or smiling, in the case of Biden — the two largely avoided speaking over each other.Trump, in particular, was on his best behavior, especially early on, and especially when it.