This ad from Americans for Prosperity, a PAC that has spent a million dollars so far in Colorado, criticizes Sen. Mark Udall over the Affordable Care Act.

(Photo: Screenshot)

Political ads in Colorado topped $60 million as of Friday, Sept. 5, with enough ads to fill 25 straight days of viewing.

Colorado differs from the national scene in that Democrats are leading in ad buys, particularly in the heated U.S. Senate race between Democratic incumbent Sen. Mark Udall and GOP challenger U.S. Rep. Cory Gardner.

And, as in Colorado, outside groups are beating candidates in ad spending, the Wesleyan Media Project reported.

The Wesleyan Media Project uses data from Kantar Media/CMAG, a private company, to analyze political advertising. It is based on videos recorded by Kantar/CMAG, and doesn’t include local cable buys.

CPR’s analysis is based on contracts filed by Colorado TV stations with the Federal Communications Commission (FCC). It doesn’t include ads broadcast solely on cable or satellite television, because those aren’t reported to the FCC.

The party breakdown

Nationally, 52 percent of ads aired through Aug. 31 favored Republicans and 40 percent favored Democrats.

In Colorado, 47 percent of the ads purchased through Sept. 5 favor Democrats, while 43 percent favor Republicans. The rest focus on initiatives on the November ballot.

Here’s a breakdown of the ads by affiliation:

The outside cash

Four of the top five spending groups nationally are active in Colorado:

  • Americans for Prosperity spent $16.7 million nationally, and is spending about $1 million of that in Colorado supporting Republicans and opposing Democrats so far.
  • The Senate Majority PAC spent $16.6 million nationally, with about $5.8 million in ads aired or scheduled to air in Colorado. The group is the No. 2 advertiser in Colorado thus far.
  • Crossroads GPS has spent $8.1 million nationally with more than $6.7 million in ads planned for Colorado. The group affiliated with former Bush administration adviser Karl Rove is the top advertiser in Colorado.
  • The U.S. Chamber of Commerce is spending $7.9 million nationally, and about $1.5 million in Colorado. The Chamber last week began a new round of ads criticizing Udall.

Of those groups, only the Senate Majority PAC discloses its donors. The rest are nonprofits that don’t disclose funders. The ads by the nonprofits may criticize Udall, but they don’t specifically say to vote against him.

Here’s a look at Colorado’s television advertising by advertisers:

Going negative

If you’re a TV viewer fed up with the constant stream of political ads, it’s likely because they’re so negative. So here’s some history.

Sunday marked the 50th anniversary of what is considered the first airing of a negative ad, called “Daisy.” It juxtaposes a young girl with a daisy with a nuclear explosion, urging voters to reelect President Lyndon Johnson.

The differences between the original attack ad and today’s ads?

“Daisy” was a minute long, and it only ran once. Today’s ads are 30 seconds and will keep coming through Nov. 4.