The world reacted with great optimism at the news announced in November days after the election that test subjects given a COVID-19 vaccine being developed by Pfizer had 90 percent fewer symptomatic infections of the China coronavirus than those given a placebo.
This was after the November election. Pfizer delayed their testing to not influence the election — for Trump.
President Trump repeatedly said in the fall that it looked like a vaccine might be announced in October. Trump was on the right track, but the science community decided to hold off until after the election.