COLUMBUS, Ohio — Two courts tooday upheld a weeklong period in Ohio in which new voters can register and cast an absentee ballot on the same day.

Another court decision was expected later in the day over the early voting window, which begins tomorrow and has become a highly partisan battle in a swing state where President Bush narrowly clinched re-election in 2004.

In a 4-3 decision the Ohio Supreme Court said Secretary of State Jennifer Brunner was correct in her interpretation that voters don’t need to be registered for at least 30 days before receiving an absentee ballot.

Ms. Brunner, a Democrat, has been heavily criticized by Republicans who have said she interpreted the same-day registration and voting window to benefit her own party.

In another decision, U.S. District Judge James Gwin in Cleveland issued a temporary restraining order forcing Madison County to follow Ms. Brunner’s instructions on early voting. The county had said it was going to follow the advice of its county prosecutor and not allow same-day voting during the six-day window that runs through Oct. 6.

The Ohio Supreme Court has six Republicans and one Democrat. Judge Gwin was appointed to the bench by former President Bill Clinton.

In the day’s last courtroom battle, the Ohio Republican Party has filed a statewide challenge in federal court in Columbus before a judge appointed by former President Ronald Reagan.

The ruling by the Ohio Supreme Court a was loss for two voters who had sued and were backed by the state GOP. Republicans argue that Ohio law requires voters to have been registered for at least 30 days before they can cast an absentee ballot and that the law doesn’t allow same-day registration and voting.

But Ms. Brunner interpreted the law correctly, Judge Gwin said in his ruling.

“We believed all along the law was very clear,” a staff attorney for the American Civil Liberties Union of Ohio, which brought the case against Madison County, west of Columbus, Carrie Davis, said.

The disputed voting window results from an overlap between Tuesday’s beginning of absentee voting 35 days before Election Day, and the Oct. 6 end of voter registration period.

“The Republicans’ cynical 11th-hour ploy to disenfranchise Ohio voters has been soundly rejected in federal court,” the Ohio Democratic Party chairman, Chris Redfern, said.

An Ohio Republican Party spokesman, John McClelland, said the party was declining comment until all three court rulings had come in.

Senator Obama’s campaign has extensive plans to try to get college students across the state to register and vote during the window. Other groups, including the Northeast Ohio Coalition for the Homeless, have plans to drive the homeless, low-income, and minority voters to the polls during the window.

And despite the Republican legal action against the window, Senator McCain’s campaign has encouraged voters to prepare for it.

Republicans have said they were concerned that providing an absentee ballot to a voter before checking whether the registration was valid would open the door to voter fraud.

Ms. Brunner has instructed election officials to segregate the ballots cast by those who registered on the same day and verify the registration information before those ballots are counted on Nov. 4.

____

Associated Press Writer Thomas J. Sheeran in Cleveland contributed to this report.