Not to spam the forum (or at least no more than the original poster did, by starting three different threads with the same claim), I will repeat a post that I made a while back in a different thread. As Megan1967 affirms, it is indeed possible to register at the polls on Election Day, although it is important to bring certain information with you to the polling place if you plan to do this.
Excerpted from a recent article in The Wisconsin State Journal in Madison: the author is Mark Pitsch and it appeared in the Journal on 9/27/08. Full text may be found at
WISCONSIN STATE JOURNAL
Go to vpa.wi.gov to look up the status of your voter registration. You enter your name and birth date, and you will see whether you are active or inactive. "Active" means the new statewide voter database has up-to-date information about you, and you don't need to bring anything to the polls. "Inactive" means your name won't appear on the poll list, and you should call your municipal clerk. You may have to register at the polls, which requires showing proof of residence. NOTE: the website data is imperfect, some voters' names produce multiple records, usually because they have moved and their registration records have not yet been merged. Make sure you are registered in the locality where you vote, and, again, it won't hurt to call your local clerk.
If you have received a letter from the Government Accountability Board telling you it needs your date of birth, respond by mailing the completed form to the board. … Officials say that recipients of this letter should not worry that the letter is a scam. It should have a detachable form at the bottom of the letter and will come with a preprinted envelope addressed to the accountability board.
On Election Day, be prepared for long lines at the polls. Bring an official (i.e. state-issued) form of ID such as a driver's license, and a proof of residence such as a utility bill or a copy of a lease if your ID doesn't show your current address. Do this even if you are already registered at your current address!
If you anticipate difficulty getting enough time to vote on November 4, you can vote absentee starting on October 6. Absentee voting can be done in person at your clerk's office or by mail. You must request an absentee ballot in writing.
Provisional ballots: If you are a first-time voter who registered by mail, didn't show proof of residency at the time and you don't take proof of residency to the polls, you would be required to use a provisional ballot. If the state database does not have your driver's license or state ID number on file and if you can't provide it when you go to vote, you would be required to use a provisional ballot. If you cast a provisional ballot, you MUST either return to the polls with correct identification by 8:00 p.m. on Election Day, OR take the correct identification to the municipal clerk's office by 4:00 p.m. on the day after the election, in order for your vote to count.