A random person's video carries more weight than a random person's unsubstantiated claim because video is, to some degree, evidence (it would be possible to fake, but would at least require some work).
http://www.youtube.com/watch?v=0MHwNZkNFlI
Is there any video of these sorts of "garden variety" bugs happening in favor of Democrats?
In any case the mere presence of this type of bugs are a really strong point against wasting money in these devices.