What it shows is that, depsite some misgivings, including my own, about electronic voting machines, they are much less susceptible to vote fraud than paper ballots, which can be bulk-punched thereby producing the infamous "hanging chads."
Bush won bigger where fraud was less.
Or, as others have noted above, apparently the 'Rats haven't figured out how to cheat on them ... yet.
We still need to improve the e-voting machines. They should have an auditable paper trail, for instance. The software on both the machine in the booth and the collection servers needs better auditing.
Like counterfeiting currency, this will be a never ending battle, between the white hats and the black hats. There is way too much power and money flowing threw our government for the black hats to stop trying to control elections.