If you are a US citizen, today is your day. Vote!
If you use a touch-screen voting machine, verify your choice before submitting your vote. The EFF is reporting problems where voters state their choices are not being recorded correctly. If in doubt, request a paper ballot (personally, I'd do this by default).
If you are undecided: WTF! Seriously, you can't be undecided, can you? Need help deciding? Let me know and I'll tell you who to vote for 😉
If you are thinking about not voting: WTF! Even if you wanted to, it would be hard to avoid the coverage of the candidates and issues. There is no excuse for being uneducated. If you are just apathetic, can you be persuaded with a donut and/or a cold beer? If so, let me know and I'll tell you who to vote for 😉