 As one senior campaign official put it to me, quote, there's no question this is the toughest moment we've had of this campaign. You may be sitting at home wondering why does George Clooney's opinion matter? Well, he's someone who spent personal time with the president just over three weeks ago and noticed his decline, having met with him several times in years past. So he's a well-known character witness for many voters concerned about President Biden's age and abilities.