HARRISBURG, Pa. -

Pennsylvania Governor Tom Corbett is asking a judge to overturn his ruling that says voters should not have to show photo identification at the polls.

The governor says Commonwealth Court Judge Bernard McGinley made a mistake earlier this month when he ruled Corbett's 2012 voter ID law unconstitutional.

Lawyers for Corbett say the judge made a host of mistakes in deciding to throw out the state's requirement that voters display photo identification.

The team of private lawyers and the attorney general's office on Monday filed 39 pages of post-trial arguments that ask for the law to be reinstated, the decision revised or a new trial ordered.

Corbett signed the bill in March 2012 despite the opposition of every Democrat in the legislature. It hasn't been in effect because of the legal challenges.

If Corbett wins, he plans to ask that the law not be in place for this year's election, to avoid "even the chance" that voters may be confused.

U.S. Sen. Bob Casey (D-Pa.) said he was disappointed in Corbett's decision to contest the court's decision.

"From the beginning, this law has been designed to prevent many Pennsylvanians from exercising their right to vote and has the potential to impact residents young and old, from urban and rural counties. Whenever Pennsylvania’s so-called ‘Voter ID’ law has been held to a test of basic fairness it’s failed," Casey said.

"At a time when we need to encourage more people to vote in elections this law runs contrary to that goal. Historically, our Commonwealth has always moved to expand and encourage voting by our citizens. The Voter ID law would reverse much of the progress we’ve made over the years,” he added.