No fact whatsoever. I could go out and find a thousand democrats who'd claim to have seen something like that. Hell, I bet there are some republicans who'd do the same thing.
The real fraud is the numerous cases of re-registration. Paying people to gather registrations is only asking for corruption... In Colorado, there's a video (
http://www.9news.com/includes/playlist.aspx?fn=http://wm.gannett.speedera.net/wm.gannett/kusa/1097555316865-10-11-voterregistration-10p.wmv&sp=randomize) with people who've done the multiple-registration scam... one lady registered herself 25 times one day, then did her friends 30 times. she forged their signatures, and guessed on their personal contact information. Another guy is laughing when he tells about how many times he's re-registered.