Well, this blog post is poorly timed, but maybe it will help some of you. Here is what to do in case you recently moved. From the Missouri Secretary of State Website
What should I do about my registration if I marry, move, or change my name
In order to change your name in the voter registration lists, you need to contact the election authority before the election or an election judge at your polling place and notify them of the change. The election authority will enter the change on the record and issue new voter identification cards. Voters are allowed to vote at one election under the old name without changing their voter registration.
The best way to update voter registration information is to contact your local election authority. Contact information for Missouri Election authorities can be found here.
If you have moved to a different address within the same county, you are permitted to change your registration address on Election Day at your new polling place or the central polling location. It is recommended that you contact your local election official with any address changes prior to Election Day in order to determine your assigned polling place.
In order to change your address if you move outside the boundaries of the election jurisdiction in which you were previously registered, you will need to fill out a new voter registration form at any of the offices where registration is permitted.
If you moved before the deadline to register for an election, you must complete your new registration prior to the registration deadline in order to be eligible to vote a full ballot. If you moved after the registration deadline, you will be entitled to vote a limited ballot, containing only federal and statewide candidates and issues once you submit a completed voter registration application in person with the local election authority. People moving from one election jurisdiction to another prior to the registration deadline who fail to register to vote by the registration deadline will not be able to vote in that particular election.
If you moved to Missouri after the deadline to register for a presidential election, you are entitled to register and vote only a presidential and vice presidential ballot.