This story was originally published by The Center for Public Integrity, which is a nonprofit, nonpartisan investigative news organization in Washington, D.C. Editor’s note: The Center for Public Integrity is tracking political advertising in races for the U.S. Senate and state-level offices. Use these two, interactive features — with new data every Thursday — to see who is calling the shots and where the money is being spent. Three political ads every five minutes. That’s what television viewers in North Carolina and Iowa endured last week — and those are just the ads targeting the states’ hyper-competitive U.S.