No interview could reverse the damage that Joe Biden did to his campaign in the first presidential debate, but his conversation with George Stephanopoulos tonight showed that the president doesn’t even understand how profound the damage is. The 20-minute interview, which aired this evening on ABC, featured a combative Biden, more like the president who gave a widely praised State of the Union address in March than the one who crumbled on a debate stage last week. Biden didn’t merely have a “bad night,” as he said at one point, the way former President Barack Obama did during his first debate against Mitt Romney.