Four years ago, candidate Obama promised to break out his walking shoes and join the picket line if anyone threatened the collective bargaining rights of workers.

He forgot that promise when Governor Scott Walker stripped most public sector workers of their collective bargaining rights two years ago. He did not join the people who protested Act 10 in Madison.

And most people understand his unwillingness to inject himself into the Chicago teachers’ strike (which does not threaten collective bargaining rights).

But now he gets another chance in Wisconsin! A judge says the law is unconstitutional. President Obama taught constitutional law. What does he think? Is it fair to preserve the rights of firefighters and police, but not teachers and nurses?

What will President Obama do? This is not a battle between two allies.

Speak up, Mr. President, please.