Here is only one:
The voting machine provider/manufacturer, almost 100% far right-wingers, provides the memory cards used to download the totals from the machines to take to the central tabulator. It is quite possible (as shown in an impromptu experiment in HACKING AMERICA, the documentary on HBO with Bev Harris, I believe in 2006) to have an executable file on the memory card that automatically alters the results recorded on the computer. For example, every vote in column A counts as .9 while every vote in column B counts as .1. The total vote number is averaged and will come out exactly the same number of people who voted except that the result is compromised. Or the results can just be altered in any way you want, just changing the final result to whatever percentage is desired, 51% to 49% e.g. only with the wrong candidate winning. This can also be done at the level of the central tabulator of course, which means only one person needs to know or maybe it's all on the memory cards provided by the manufacturer and nobody knows but the manufacturer.
Anybody who thinks that these machines have not been rigged in the last decade or so in many elections is in need of reality therapy. Jon Simon of ELECTION DEFENSE ALLIANCE, in his book CODE RED, has analyzed some of ways that the vote can be safely altered without the slightest chance of anybody finding out. He also gives some real world examples where the result was almost certainly altered, that is, if one is to believe that statistical analyses of voting results comparing unadjusted exit polls with the supposed election results from the machines.
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