If the election was today, maybe, but it isn't. Humans are human, and totally predictable. Whether you are with a half dozen people in a bar when a fight breaks out or the place catches fire, or with 350 million people in a country when a building blows up or a pandemic strikes, the same thing will happen. The initial response will be "who is in charge thank god it's not me." That translates automatically into an approval spike for whoever has the guts or the lack of options to wind up in charge. It's the theory behind "wag the dog" military operations in an election year, it accounts for GWBush's extraordinary approval ratings after 9/11, and it is the reason D'ump has taken to referring to himself as a "wartime president."
But the most important thing to understand about that human response is that it never lasts. In the 20/20 vision of hindsight whoever took charge is revealed to have made bad split second decisions, always. Taking charge invariably brings along responsibility, and since the situation was bad to start with whoever took charge will end up with the blame for every bad outcome unless they miraculously prevent any bad outcomes for anyone. Even the most faithful Trumpists, if confronted by a dead family member or having to stand in a bread line, will have a hard time saying how great his performance was.