YOU WOULD think that everything about this year's presidential election has changed over the past month. With corona-virus sweeping the country, President Donald Trump suggesting that Americans might want to disinfect their veins and Joe Biden going underground, such an assumption would appear reasonable. State-level political polls, which are known to oscillate wildly from day to day, show the former vice-president gaining a lot of ground in recent weeks. Yet there is actually little evidence that the picture has changed at all since February. Mr Trump's approval ratings are exactly where they were when the outbreak of covid-19 began. Properly weighted public opinion polls that account for interviewees' political affiliations reveal that Mr Biden holds just the same lead over the president as he did back in March.
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