American citizens as well as non-citizens that wish to work in the U.S. are all given a Social Security Number.
How?
Using a government secure database, you will be able to log in as a registered U.S. citizen and vote for your candidate online.
Fraud?
Yes, thieves could steal your SSN and vote as they see fit, however the solution is very simple. When voting online if you discover your vote was already cast, your account will be frozen and investigated. This works well since there are no duplicate SSN's.
-SSN's of the deceased will already be added to the database and blocked to prevent fraud.
-Polls before and after your vote will be made available to show your vote was cast correctly.
-Extreme penalties could be used with individuals who commit fraud; 10 years or more in jail.