Republicans had a very nice showing in the the House, Senate, and at the state level, so if this voting machine debacle is true and thousands of votes throughout all the states have flipped votes from Trump to Biden... why wasn't this the same case for other candidates on those ballots?

Is this because of voting machines being used primarily in areas where House/Senate seats weren't up for grabs? I'm asking because I haven't compared where these machines were used to the districts where other candidates were up for re-election. Anyone know?