During the 2012 vice presidential debate with Paul Ryan in October, Ryan teased Biden about his habit of making gaffes.
"I think the vice president very well knows that sometimes the words don't come out of your mouth the right way," Ryan said.
Biden shrugged off the jab.
"I always say what I mean," Biden responded.
—This story was updated at 3:40 p.m. and 5 p.m.