From a Columbus Dispatch story on election developments in Ohio:

Starting today, county elections boards can begin verifying voter eligibility for absentee ballots cast and discard envelopes to process ballots for scanning. Those envelopes are the only way to link a ballot with a particular voter.

With that deadline looming, 13 Obama staff members sent letters yesterday to the Franklin County Board of Elections voluntarily withdrawing their voter registrations and any absentee ballots cast.

County Prosecutor Ron O'Brien wrote to the campaigns this week reminding them that state law doesn't allow temporary residents to vote; voters must live at their registered address for at least 30 days before the election and intend to become permanent residents.

But no McCain staffers followed suit. "We have consulted with elections officials and have written them to confirm that our staff meet all requirements of Ohio law and are legally registered to vote in the state," said Jon Seaton, McCain's regional campaign manager.