In the scenario you're talking about, that would be the moment when US democracy is definitively in the can, beyond hope of recovery by conventional means. That would be the right time to overthrow the administration by any means necessary. But yeah I really wonder if even then there would be enough collective spine to make it happen. Every effort will be made to muddy the waters. The vote will be rigged wherever possible. The white house will announce a resounding success. Most news outlets will parrot this line. From some democrats there will be "deep concern" about how the elections were handled. There will be calls for an immediate investigation. Some investigations will take place and there will be findings and condemnations, which ultimately have no effect. But the cumulative message will always be : "now is not the time"