As JV Last says [Bulwark paywalled], even if she wins and none of Trump’s attempts to overturn it succeed, he will still say that he won and will convince many Republicans that it’s true. The results of that will be a Republican Party that continues to be required to adhere to the Big Lie even if Trump is out of the picture which means:

"[W]e’re going to have another four years in which the price of admission to Republican politics is claiming that the sitting president is illegitimate."