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Barack Obama is using his cash advantage to overwhelm John McCain on the airwaves, outpacing his opponent in nearly every battleground state according to the latest data from the Wisconsin Ad Project [PDF]. Moreover, Evan Tracy, head of TNS Media Intelligence/Campaign Media Analysis Group, indicated in a blog post last week that Obama is on pace to spend more money on ads in the final 25 days of the campaign than McCain's entire $85 million allotment of public campaign funds. (McCain is also getting help from the Republican National Committee, but the Obama camp still bests both combined in fundraising).

Here are several spots that the Obama campaign has released in recent days:

"Lose" (subscription) pounds McCain for resorting to a "smear" campaign at a time of national economic crisis. "It's clear: With no plan to fix our economy, smears are all McCain has left," an announcer declares. The ad responds specifically to two allegations from the McCain camp regarding Obama's ties to Chicago politics. As a picture of a Ramada Inn appears, the announcer insists that is the location where Obama launched his political career, not the living room of Weather Underground member William Ayers. In response to a spot (subscription) released by the Republican National Committee that calls Obama adviser William Daley the "heir to the Chicago machine," Obama's ad notes that Daley was "confirmed as commerce secretary and praised for his great work by none other than John McCain."

A new radio ad (subscription) featuring Tony Dean, host of a popular Midwest outdoors TV show, continues Obama's outreach effort with rural voters. "You know, I'm a lifelong Republican. But this year I'm voting for Barack Obama," Dean tells listeners, insisting that Obama will protect Americans' Second Amendment rights "and preserve our way of life." He then turns to an economic pitch, saying "Barack will protect our jobs, too. He's got a plan to rebuild America." Dean also goes after McCain for his campaign tactics and record on the economy. "He says he's a straight shooter, but his attacks on Barack Obama are way off target," Dean quips, adding that "McCain's just trying to camouflage his record." The spot is running in Minnesota and Wisconsin, both states that Pollster.com places in the "lean" Obama category.

Finally, in "Impuestos" (subscription), a Spanish-language radio ad, Obama contrasts his plans on taxes and health care with his opponent's. The announcer says that McCain's tax breaks will go to big companies, not working-class Americans, and that his health care plan "punishes us" and rewards insurance companies by taxing benefits "for the first time ever." "Barack Obama and the Democrats," on the other hand, "know that working people and the middle class are the ones that most need relief during this crisis," the announcer insists.

Whereas the Obama campaign had been mainly targeting four states -- Colorado, Florida, Nevada and New Mexico -- with its Spanish-language advertising, "Impuestos" expands that buy to several other battleground states as well: Pennsylvania, Michigan, Wisconsin, Indiana, Ohio, and Virginia.