What in life can be done 17,700 times without even a single error if not by design?
Processes with this performance are present but they are not so by chance.
AND you KNOW that these people all submitted their votes perfectly 17,700 times in a row without any mistakes at all how?
No, not in a row. It's roughly 400 perfect votes in a division, 59 times. There are over 1000 divisions, obviously not all divisions are 100% Obama country. But undoubtedly 100's of them are. So 59 perfect scores out of at least a few hundred tests.
As I said above, the best explanation is gatekeeping where the voter who "might need help" gets some help pressing the right button. A perfect 400 out of 400 is possible without gatekeeping but gatekeeping would make it almost certain.
Other than that, the voting machine is ridiculously easy, there is a large square that turns into a check mark next to Obama. The error rate is going to be very low although I need to look for some academic papers on how low.