I don't care for who.
I don't care how.
If you live in the US and are registered? GO AND VOTE.
If for some reason you are not on the roster? Cast a provisional ballot. They have to let you. If the computers are down? Cast a provisional ballot. You have the right to cast a vote - technology, human error, shenanigans or arse marmotry cannot stop you.
If you're not registered? If you are registered and choose not to vote anyway? What are you THINKING? I revoke your bitching privileges for the next 2 years.
And thank a pollworker on your way out the door. It's a long hard day for them.