The GOP missed a big chance to clean up the lists and penalize false/dead voters and those who register them when they had the majority and the Presidency. It was obvious in 2000 and 2004 in such diverse Dem-pits as Milwaukee, Philadelphia, and reportedly the New Mexico Indian reservations, that votes were being manufactured. A few cases were brought, but there was nothing like the enforcement effort that was needed.
Just ask B1 Bomber Bob.