More Than Anonymous
There are too many ways to hack into computers to make them safe for voting. There are secure methods of connecting computers but that implies that the computers are secure and not infected with a trojan that can snoop for connections to a secure ports and substitute the information.
These things can be done by fairly low level black hat hackers. Anonymous is a bit more sophisticated. Beyond Anonymous there are the state sponsered hackers who can create a campaign that is both difficult to detect and to stop.
The last thing we in the US need is another reason to doubt the legitimacy of people elected.