We mentioned yesterday how the national GOP is gearing up against Bob Casey, even without a big-name candidate in place, hitting him on abortion and other matters.

Now he is being targeted along with 12 other Democratic Senators nationwide -- including Jay Rockefeller and Joe Manchin -- in an ad campaign from the National Association of Manufacturers that launched Monday on the EPA. The environmental agency is "pushing a costly new regulatory agenda" that will kill jobs and drive up energy costs, a radio spot claims, and urges listeners to call Casey and "tell him to stand up for Pennsylvania workers and manufacturers."

Now, given the GOP ties of the group, we raise an eyebrow at all the talk in the spot about workers -- the interest in the EPA (here's something on new pollution standards released March 16 for coal-fired power plants) is a lot more about the bottom line for manufacturers (it is the Natl Assoc of Manufacturers, after all) and budget-related fights against the EPA that have been a theme in Washington since the GOP takeover of the House this year.

You can listen to the spot here.

UPDATE: Energy wonk alert: Obama is giving his latest speech on energy research and foreign oil today at Georgetown U. The NYT has a preview, saying it's mostly a review of past announcements.