"And, he's a grown man, he is the smartest man I know, I mean from a pure intellectual capacity."

That's the most inane line in Joe Biden's answer to Stephen Colbert's ludicrously leading question, reported at CBS News: 

"What are you going to do and how will you sustain each other for the attacks you know are coming your way?" Colbert asked. "Case in point, I know you want to be as bipartisan and reach across the aisle, but as much as you don't want it to happen, you know that the people who want to make hay in Washington are going to try to use your adult son as a cudgel against you. How do you feel about that, and what do you have to say to those people? 

"We have great confidence in our son," Mr. Biden told Colbert. "I am not concerned about any accusations that have been made against him. It's used to get to me. I think it's kind of foul play but — look, it is what it is. And, he's a grown man, he is the smartest man I know, I mean from a pure intellectual capacity. And as long as he's good, we're good." 

As long as he's good, we're good! Colbert had to rush in to help:

Colbert responded: "As a father I understand that and I admire that. But I mean, in terms of your job as president, can you reach across the aisle to people who'll be using this as an attack on you when it is such a personal attack because it's about family?" 

Notice how both times Colbert asked a question on this topic, he signaled to Biden that he needed to attack his attackers. Your antagonists are using your son as a cudgel, they're going personal — aren't they awful? Biden responded blandly:

"But if it benefits the country, yes. I really mean it," Mr. Biden said. "Because we know who we are."