I do not believe that there was a conspiracy from the highest levels of government to rig the last election, but I think it possible, and even likely, that one or a few local election officials with strong republican ideology manipulated the results/rigged machines/falsified records/etc.
Isn't it true that the inventor/owner of the Diebold voting machine company is a multiply-convicted fraudster and rabid republican fanatic?
The BIG conspiracy theory is just too big. I don't think a secret that big involving (presumably) lots of people, could be kept secret.