Joe Biden: bumbling, confused, and a heartbeat away from the presidency.

Updated: Biden forgot which state he was in during a campaign stop in Ohio, saying ”this is a guy who’s running all the ads here in Iowa.”

Updated again: “While on the campaign trail for Obama in the battleground state of Virginia on Saturday, the vice-president gave a shout-out to Senate hopeful Tim Kaine but referred to the local candidate by the wrong name. ‘I’m a big Tom Kaine fan, a big Tom Kaine fan,’ Biden said enthusiastically.”

Updated for a third time: Biden accuses Romney of voting to give “a $500 trillion dollar tax-cut to 120,000 families.” Note that the gross domestic product (GDP) of the United States is approximately $15 trillion.

Updated for a fourth time: Biden refers to Obama as “President Clinton.”