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On Monday, we looked at Republican presidential challenger Mitt Romney's strengths and weaknesses as a debater. Now we examine President Obama's record in big debates and the challenges he faces.

In Pennsylvania, a judge has issued a preliminary injunction against the state's controversial voter ID law. In effect, the judge's ruling will allow registered voters to cast ballots in the upcoming election, without showing the government-issued ID required by the law.

You can believe this latest poll result if you'd like. Or not.

A survey released Tuesday that was conducted by Public Policy Polling asked people if they thought pollsters were rigging their results to show President Obama leading Mitt Romney (h/t Josh Voorhees at The Slatest).

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AUDIE CORNISH, HOST:

The same could be said for another feature of the president's Affordable Care Act: the state health exchange. That's the online marketplace where individuals and small businesses can buy private health insurance. The law requires every state to have an exchange up and running by 2014.

MELISSA BLOCK, HOST:

Scientist Barry Commoner, a pioneer in environmental activism, died Sunday. Melissa Block speaks with Michael Egan, environmental historian at McMaster University in Hamilton, Ontario, and author of the book, Barry Commoner and the Science of Survival: The Remaking of American Environmentalism.