>10s of cases out of 100s of millions/low billions of votes cast

I know of at least 2 people in my friend group who voted in their "home states" that they haven't lived in for 4+ years. I don't know if this is considered voter fraud, but if it is, it certainly undermines integrity of this claim.

In any case, at the macro level, there isn't reason to believe one party participates in this more than the other.