No matter who you plan to vote for in November, please take the time to register to vote. Each state has its own voter registration deadline. Check your State Board of Elections website for the specifics. The deadline for Virginia is October 6 (29 days before the election).
VoteforChange.com is the easiest way I have found to check on your voter registration status and update any outdated information. It only took two or three minutes, and I had all of my paperwork filled out and ready to send to the Board of Elections. So, what are you waiting for? Do it! Register to vote!
(Full disclosure: VoteforChange.com is paid for by Obama for America. At posting time, I could not find a similar feature on johnmccain.com. You could Google your State Board of Elections for a non-partisian registration outlet.)