Could it be possible that they brought out the machines and they weren't "Cleared" yet from the last election they were used in? With all of these poll watchers just itching for chance to yell fraud, its going to be easy to find instances where things look suspicious, but may not actually be fraud. I'll wait for the rest of the story to see if its actually fraud or not.
Not likely, since loading the new ballots likely requires a reset as it is.
Clarifying: your theory would be correct if quite a few of the pre-votes turn out to be for Gore :)