June 28 (Reuters) - A group of U.S. voters who were unable to choose between Joe Biden and Donald Trump before Thursday’s presidential debate delivered their verdicts after the contest and it was almost universally bad news for Biden.

Of the 13 “undecideds” who spoke to Reuters, 10 described the 81-year-old Democratic president’s performance against Republican candidate Trump collectively as feeble, befuddled, embarrassing and difficult to watch.