Click here to watch "Figured."

Oops. Joe Biden declared recently that the Democratic ticket was against clean coal when Barack Obama's energy plan explicitly shows the Illinois senator's support for it. This gaffe, which Biden made at a campaign rally in Ohio, has prompted three new ads -- two by John McCain attacking his opponent over it and one by Obama aiming to emphasize his commitment to clean coal.

Obama's ad makes no attempt to reconcile Biden's comment with the Illinois senator's position on the issue, but rather seeks to portray Obama as a longtime friend of the coal industry. "Figured" (subscription) features Randy Henry, an Illinois miner, vouching for Obama's support of the industry as a state and U.S. senator. While the candidate may be from Chicago, Henry insists that Obama made a concerted effort to visit coal mines in Southern Illinois and help communities that were struggling as mining jobs disappeared.

Meanwhile, the McCain camp released a radio ad, "Clean Coal" (subscription), Monday in Colorado, Pennsylvania, Ohio and Virginia that features a clip of Biden's comment, charging that "Obama-Biden and their liberal allies oppose clean coal." The spot argues for the importance of clean coal, specifically to the residents of the aforementioned battleground states, and links the Democratic ticket's alleged opposition to clean coal with other energy issues. "No energy independence for America? It's no surprise," an announcer says. "After all, Obama-Biden and their liberal allies opposed offshore drilling." The script of the ad is virtually the same in each state; only the reference of the state name changes from market to market.

The McCain camp also released a mocking Web ad last week, "The Coal Miner," which juxtaposes footage of Obama speaking in support of clean coal with Biden speaking in opposition to it. The ad concludes with text on screen reading: "Obama + Biden. Ready to pander? Yes. Ready to lead? No."

-- Mary Gilbert contributed reporting to this post.