A coalition opposing the voter ID constitutional amendment has picked former Vice President Walter Mondale and former Gov. Arne Carlson to help lead its statewide campaign.

The Minnesota Supreme Court heard arguments Tuesday afternoon in a lawsuit aimed at keeping the voter ID constitutional amendment off of the statewide ballot. The American Civil Liberties Union of Minnesota, League of Women Voters Minnesota and other anti-amendment groups are asking the court to strike down the ballot question. They claim its wording is too vague and misleading.

In a shocking upset, the voter ID amendment has failed, and by a sizable margin. With 98 percent of precincts reporting, the "no" votes led by nearly 8 percentage points, MPR says. The measure would have amended the state constitution to require voters to bring photo IDs to the polls.

The measure advanced through a House committee on a party-line vote Monday. If the House and Senate pass the proposal, then voters in the November election will decide whether to amend the state constitution to require that all would-be voters present a photo ID before they cast a ballot.

Proposals for a constitutional amendment requiring photo IDs at polls are just a step away from reaching the House and Senate floors, MinnPost reports. Constitutional amendments, if approved by the Legislature, go straight to voters. They do not require Gov. Dayton's signature, so he cannot veto them.

A court case challenging Wisconsin's voter ID law is scheduled for trial on April 16th. The judge's injunction means photo IDs will not be required to vote in the state's election on April 3rd. The judge also said there's a "very substantial likelihood" the plaintiffs will win their challenge of the law.

Congressman Keith Ellison is circulating a resolution opposing a voter ID requirement and is urging Democrats to adopt it at their precinct caucuses Tuesday. Republicans in the Legislature hope to put the issue on Minnesota's ballot in November. Ellison says Americans who don't have photo IDs should still be allowed to vote.

Estimates of how much it will cost to implement a voter ID requirement at Minnesota polling places range from a few million dollars to $100 million. The cost is among many details that state lawmakers will need to fill in if residents approve a Constitutional amendment requiring a government-issued ID to vote.