At a campaign event in Tampa on Tuesday, Biden was discussing his staunch pro-union stance when an appreciative audience member shouted out, "The only reason I have a pension is because of you."

The supporter seemed to be referencing the $36 billion in federal aid the president devoted to preventing pension cuts for more than 350,000 union workers and retirees.

"Well, we did get that done," Biden replied, adding, "Besides, I used to drive an 18-wheeler."