(CNN) - Rule 1 of public speaking: Don't insult your audience.
But in the case of Vice President Joe Biden during a speech before donors in Madison, Wisconsin Thursday, that tactic just may have worked.
The vice president was repeatedly attempting to rile the Wisconsin crowd of donors in support of gubernatorial candidate Tom Barrett by listing a litany of Democratic accomplishments and warning Republican policies could put the economy back in a tailspin.
But the sleepy crowd's polite applause was not the reaction the vice president was hoping for.
"You're the dullest audience I've ever spoken to!" Biden declared. "Do you realize how many jobs Wisconsin lost? It's staggering!"
The crowd immediately laughed in response, with some rising to their feet in applause. Needless to say, the crowd appeared to make a more concerted effort to react to the vice president's overtones during the remainder of the speech.
Biden heads to the Seattle for more fundraisers Friday – where, presumably, the audience will be more caffeinated.