It is a criminal act to use the USPS to influence or suppress the electoral process.

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8. a prosecutor would have a tough time clearly tying it to an election.

if there's a paper trail talking linking the two, obviously that would be very helpful for the prosecution.

if they started doing it right before the election, the timing might also be compelling.

but with the election still months away, it's hard to prove they're linked beyond a reasonable doubt, even if outside a criminal courtroom we can feel fairly confident of their motives.