If you've legally changed your name (i.e. you got married, or decided "Batwing Candlewax" sounds cooler than "John Smith") you might not be registered to vote.
If you haven't actually voted in the past few elections, you may have been "purged" from the voter rolls as "inactive" and, you guessed it, you might not be registered to vote.
If you're in the State of Washington, the deadline to register to vote is coming up very soon on October 4th - less than two weeks away! You're registration must have an October 4th or prior postmark if you mail it in!
If you're NOT in the State of Washington, go to www.VoteForChange.com which will walk you through how and where to register for any state in the USA.
WASHINGTON STATE RESIDENTS: Visit the WA Secretary of State website to make sure your voter registration information is up to date, current, and showing as "active" at http://www.secstate.wa.gov/elections/re