Check the list for the names of individuals that have moved out of the county, are deceased, or are no longer eligible to vote for any other reason. If more than a small number of absentee ballots are being sent to the same address, that is also an indication of possible fraud. Spend the two months prior to the election recruiting poll watchers at Republican party events. People do not easily volunteer to be poll watchers - they will have to be recruited. Publicize the fact that your county will have a poll watching program on election day with the media in your county.
Publicity can help deter the other side from committing fraud.
Prior to election day, organize a team of local lawyers and investigators who are ready to hit the ground running the day after the election if possible fraud has occurred and one of our candidates has lost the election. Do not rely on the local Election Board, the Election Superintendent, or the local Probate Judge. Investigators need to be available to immediately begin talking to voters, witnesses, or anyone else who can substantiate that fraud occurred. Just calling voters who voted by absentee ballot, for example, to make sure that they actually requested and voted their ballots or that the voters really exist takes a great deal of time and manpower. This temporary election board will assume the duties of the election superintendent during any primary or election.