This is simply wrong. Do you think that the GOPe is unaware of the mechanisms of voter fraud and how to use them to their advantage in districts they control? No. They are corrupt, they are venal, they are sell-outs, but they are not THAT short-term stupid.
They are silent on democratic voter fraud because they engage in many of the same practices.
Of course both parties are corrupted. There are no good patriots in the Democrat Party, but in the Republicrat Party there are at least ten in both houses.
Yes, there has been voter fraud among republicans but nowhere near the level of that found with democrats. You might revise your opinion after reading this article: