What I really want is to limit 1 vote per person but the next best thing i can think of is limit 1 vote per IP address to prevent malicious users/hackers from severely tempe
IP address has its limitations as we have noted from above, but there are many other characteristics a browser has which can damper mischeivious voters. BrowserID, for example, is different for just about every browser. You could use a combination of BrowserID and IP address to create a unique ID.