HARRISBURG, Pa. -

Pennsylvania's new voter identification law has hit a roadblock.

The ACLU and other groups announced Tuesday that they have filed a lawsuit to get the law thrown out.

The law, signed by Gov. Tom Corbett on Mar. 14, requires voters to show identification at the polls, but a lawsuit filed against Corbett and the commonwealth may hinder the law from taking effect in November.

The lawsuit was filed by the American Civil Liberties Union of Pennsylvania, the Advancement Project, the Public Interest Law Center of Philadelphia and Arnold & Porter LLP, a law firm from Washington, D.C.

"What we are talking about here is an effort by the state to disenfranchise people who are qualified to vote under the Pennsylvania constitution," said David Gersch, attorney at Arnold & Porter LLP. "They are registered to vote under the laws of this state and they are people who actually vote."

Supporters of the law, like Republican Pa. Sen. David Argall, said it helps protect against voter fraud.

"We've had state Senate elections overturned in Philadelphia because of massive fraud," said Argall. "We've seen absentee ballots misused in Bucks County, and not that long ago in my home county in Schuylkill County, we had an election where we noticed one day more people voted then were legally registered."

But such fraud, the lawsuit claimed, has not occurred.

"We are still waiting for the commonwealth to identify a single instance of in person voter fraud," said Vic Walczak, legal director of the ACLU of Pennsylvania.

The Commonwealth Court will have to make a final decision to implement the law come November.

The lawsuit claims the law is unconstitutional because elections will no longer be "free and equal," as required by the state constitution.

According to the ACLU, more than 80,000 people will need to obtain a new photo ID to vote.

Argall said that during last week's primary, the new law was given a test run at the polls. Very few people, Argall said, complained about showing an ID.

"The people in the six counties I represent primarily said, 'Yes, vote for this," said Argall.