Kirk Siegler

How do you reach an audience of more than 200,000 people a day in an important swing state without buying an expensive TV ad?

If you're Sid Overton, you build a blimp and fly it alongside one of Colorado's busiest freeways.

"It says, 'Romney For President. He Creates Jobs,' " Overton told KUNC.

Colorado is a good venue for a presidential debate focusing on domestic issues. The first of three highly anticipated debates between President Obama and his Republican challenger, Mitt Romney, will take place Wednesday at the University of Denver.

The state is known for its independent voting streak, and much like the rest of the country, there are sharp political divides about the role of government in the economy. In Colorado, those differences grow from two distinct population centers.

Watching the first 20 minutes of Saturday Night Live's season premiere in Denver, I counted at least four ads by the Obama campaign and liberal groups backing the president. Just one ad countering their message was aired in the same span by the Romney campaign.

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The deadly movie theater shooting in Aurora, Colorado has become a key issue in at least two tight congressional races in that battleground state. Since the attacks, two Democratic candidates - running in districts in and around Aurora - have called for stricter gun laws. But Republicans have accused them of trying to politicize the tragedy.

From member station KUNC, Kirk Siegler reports.

Some well-funded pro-Mitt Romney superPACs and other advocacy groups are pulling their TV ad dollars in Pennsylvania and Michigan and are doubling down on efforts in what they consider to be more crucial swing states — such as Florida, Ohio, Iowa and Colorado.

Those are states where President Obama has also been spending considerable time campaigning lately, but where he's facing a barrage of attack ads from his Republican rival and the conservative superPACs, such as American Crossroads, and nonprofit advocacy groups, like Americans for Prosperity.