In another example of how outside groups are beginning to hammer President Obama in advertisements, the Karl Rove-backed group American Crossroads is up with a $175,000 radio buy -- which is pretty large for radio -- in Pennsylvania, Ohio, and West Virginia.
The target: coal.
This radio spot follows a TV ad Crossroads GPS (a sister group to American Crossroads) is airing against Obama on gas prices, as well as one by the American Energy Alliance on the same subject.