[Plutarch]

You’re the dullest audience I’ve ever spoken to.

I'll bet Biden prepared the remark, and his notes have it:

Your the dullest audience I've ever spoken too.

[JoenTX]

RAT strategy for campaign 2010-

insult, cajole, and berate your base into showing up and doing their duty to keep their Lib masters in their ivory towers, or else.

[Average Al]

"You’re the dullest audience I’ve ever spoken to."

You are the biggest dim-whit we have ever had to listen to.