Why did Bob Dylan wear sunglasses to the White House?

Caitlin McDevitt (at Politico) simply notes that he did, but we watched the video (over there), and this was the dialogue at Meadhouse:

ME: Look how emotional he is. That's why he's wearing sunglasses...

MEADE: He doesn't want people scrutinizing him...

ME: He's crying. He doesn't want people to see him cry. Oh, jeez, look at Obama. That smug look on his face... compared to Dylan... who is shaking and crying... [Blogging the conversation:] Did you say he didn't want people peering into his soul?

MEADE: No, I said he doesn't want people scrutinizing him. He's very expressive. He doesn't want people to be able to see that.

ME: Oh, I'm mixing it up with Bush and Putin. [Bush said: "I looked the man in the eye... I was able to get a sense of his soul..."]

MEADE: "Please don’t put a price on my soul... I know you’ve suffered much/But in this you are not so unique.... And if you don’t underestimate me/I won’t underestimate you..."

ADDED: And if you don’t misunderestimate me, I won’t misunderestimate you...

ALSO: What Bob Dylan said about Barack Obama in June 2008.