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Sequels are rarely as good as the original. We can all think of a few movie follow ups that should never have been made. American voters may have similar misgivings about the next US presidential election which looks increasingly likely to be a rerun of the 2020 contest, with the same characters in the leading roles.

Joe Biden has now confirmed he's signed up to star for the Democrats, while Donald Trump remains the clear frontrunner for the Republican nomination.