Voter fraud has been studied extensively and it is virtually non existent and the few cases of legitimate and intentional voter fraud in recent history did nothing to change any election (and were actually committed by Republicans and Democrats).  Most cases involve clerical errors and were not intentional.  Here is an excellent summary:
https://www.brennancenter.org/analysis/debunking-voter-fraud-myth

I would also recommend that for anyone concerned about election integrity they read "Give Us the Ballot" by Ari Berman which provides for a longer term historical perspective of voting rights and access in this country as well as a strong argument for intentional and targeted voter suppression.

Koback and Republicans, however, are data mining for the very purpose of putting in laws to suppress voters who are likely to vote against Republicans.  That much is quite obvious.