Seconds earlier, the 76-year-old former vice president dismissed concerns about his age.
“If they’re concerned, don’t vote for me,” Biden said.
Keene is only about 10 miles from the Vermont state line. But presidential wannabes spend countless days tramping around New Hampshire to compete in its first-in-the-nation primary, while Vermont is an electoral afterthought.
The misstep was the latest gaffe for Biden, who often strays from his campaign script to bad effect, raising worries among some Democrats about whether he is the best choice to take on President Trump.