Actually, that's not even necessary. They just track with cookies. Incognito mode with Chrome makes this child's play. Run a script to open in incognito and keeping voting till a certain point. If you want to be really scrupulous, keep changing IP.
> Run a script to open in incognito and keeping voting till a certain point
Why would you bother to script a full-fledged browser when you can just connect to the site directly through the script, ignoring cookies and/or changing the user-agent string.
