(CNN) - Joe Biden tops a list of Democrats who may be interested in a 2016 presidential bid, but appears to have stepped a bit ahead of himself Saturday.
Video posted online by the site Mediaite shows the vice president stumbling over his title at an inauguration party in Washington.
"You saw what America came to see. You saw early on, Iowa Democrats saw early on the incredible promise and the incredible capability, the incredible leadership of the guy I now serve with," Biden told supporters at the party, sponsored by the State Society of Iowa.
"I'm proud to be president of the United States, but I'm prouder to be Barack ..." he continued, trailing off as laughter erupted in the room.
"I am proud," he corrected himself, speaking over the crowd, "to be vice president of the United States."
If he was testing the waters for a presidential bid, he found a sympathetic crowd from the state which kicks off the presidential selection process with their caucuses.
The video shows him chuckling as he said, "Well, there goes that," and attempted to move on.
"Look, on a serious note," he started, as some in his audience continued to laugh. "I guess I'm not going to get back to a serious note, am I?"
After a few false starts, the video shows Biden regained his composure.
"Think of where we were when Barack was elected president of the United States," he said.
Perhaps Biden will find forgiveness from President Barack Obama, who once slipped up and offered Biden the same promotion to the top of the ticket.
When he introduced Biden as his running mate in August 2008, Obama called Biden "the next president of the United States," then quickly corrected himself.
Republican presidential nominee Mitt Romney made the same mistake last year when introducing Rep. Paul Ryan to his ticket. The music played and Ryan walked out waving. Once the applause subsided, Romney stepped back to the microphone to correct the mistake.
- CNN's Kevin Bohn and Gregory Wallace contributed to this report