Typically, any candidate can get a copy of the voting list at the town office, the County Committee should be able to get them as well.
A well organized County Committee should be able to obtain these lists, in spreadsheet format and analyze the data.
All registered Rs should be recruited to help, or compelled to vote, all unenrolleds should be targeted for R votes, all RATs should be watched like a hawk for voter fraud.
Then, the total registered voters should be compared to another list of all residents. That's where many non-voters and illegal aliens could be identified.
There are most likely modern methods of "data-mining" which may help identify individuals who are not registered, but may be of a conservative mindset...like facebook etc.
This would be a constant 2-year weekly operation, not just some last second emergency drill going down at election time.
With a gung-ho conservative committee, many hands could pull this off in any non-urban county...maybe even mid-sized cities.
Exactly, and that Conservative committee could go around both parties to get true Conservatives elected.
Now I have dined and enjoying a beer, so, to the point:
All the info you allude to is available, on CD, from the registrar, to any legitimate candidate. The amount of info one is allowed is based on the particular race one is a candidate of. If statewide, then, yes, can get statewide registrar info.
The question is, what is someone going to do with it?
Who is prepared to commit to a year of shoe leather ?
Who is prepared to donate time?
In the end, it comes down to the already established laws, the most votes wins.