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1. Before Thursday evening, many Americans had expressed concerns about Joe Biden's age and fitness for office. To say that this debate did not put those concerns to rest may be one of the greatest understatements of the year. Even if you plan to vote for him, are you concerned about Biden's age and fitness for office?

2. The president came into the debate with a low bar to clear, and he stumbled. He was flat. He was rambling. He was unclear. For 90 minutes, more often than not, he was on the ropes. Particularly early in the evening, some of his answers were nonsensical. After losing his train of thought he ended one answer by saying, "We finally beat Medicare" – an odd reference to the government run healthcare programme for the elderly. Do you think Biden performed poorly in the debate?

3. Trump largely offered a disciplined, nimble performance. He repeatedly made assertions that weren't supported by facts as well as outright falsehoods, but Biden largely was unable to corner him on them. When the topic turned to abortion, for instance, the former president repeatedly shifted attention to what he said was Democratic extremism. He claimed, incorrectly, that Democrats support abortions after babies are born. Do you think people who are undecided voters will be ore likely to vote for Trump after the debate?

4. When asked by the BBC about the possibility of opening the convention to other candidates or replacing the president, Deputy Campaign Manager Quentin Fulks said they were "not going to dignify that with a response". "President Biden is going to be the Democratic nominee, and President Biden is going to win this election," he added. Do you think they will replace Biden as the nominee?