IMHO, the biggest beneficiaries of Democrat vote fraud aren't Democrats, but RINOs. If the effects of fraud were removed and the apparent political center moved a few points to the right to match the real one, Democrats could soften their message somewhat and maintain some degree of power. They'd wouldn't be able to drive the country off a cliff as quickly as they'd like, but they could still manage. RINOs, however, would be squeezed on both sides. Republicans would no longer feel they should support mushy candidates simply because they're "electable". If Republicans could get real conservatives elected, the pseudo-conservatives would lose all raison d'être.
It should be little surprise that in areas like Washington State, the "Republicans" don't seem interested in doing anything about vote fraud. Such fraud is the only thing keeping them in power.