Eyeballs burn in North Carolina, Iowa ahead of U.S. Senate elections

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.

Related: Who's buying the Senate?

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. Senate races.

In all, U.S. Senate campaigns and various non-candidate political groups aired about 6,200 ads each in North Carolina and Iowa from Tuesday, Sept. 23, through Monday, Sept. 29, according to a Center for Public Integrity analysis of preliminary estimates from Kantar Media/CMAG, an advertising tracking service.

Related: Last week's TV ads in the 2014 battle for the Senate

Across the country, U.S. Senate elections generated about 49,000 TV ads during the last week of September, the analysis concludes.

The GOP must pick up at least six seats this year to win a U.S. Senate majority. Such a victory would all but ensure Republican control of Congress, as the GOP is widely expected to retain control of the U.S. House.

Related: Total TV ads in the 2014 battle for the Senate through Sept. 29

Related: Big money is also being spent in elections for state-level positions, bankrolling scores of ads targeting down-ballot races that criticize President Barack Obama.

In the Tar Heel State, embattled incumbent Sen. Kay Hagan, a Democrat, is vying for re-election against Republican Thom Tillis, who currently serves as the state’s House speaker. North Carolina has long been a target for Republicans eager to oust Senate Democrats from power.

Related: Who’s trying to influence your vote?

In Iowa, meanwhile, a contentious open-seat race has more recently emerged in the wake of incumbent Democratic Sen. Tom Harkin’s plans to retire at the end of the term.

There, Democratic Rep. Bruce Braley is running against Republican state Sen. Joni Ernst.

Related: Democrats seize air supremacy in Senate battlegrounds

In both states, Republicans and their allies held a slight edge over their liberal rivals in terms of ads aired during the final week of September.

In Iowa, Ernst and groups supporting her Senate bid aired about 3,500 ads, or about 56 percent of the overall total.

In addition to Ernst — who aired about 700 ads, or one ad every 15 minutes — her candidacy was boosted by groups including American Crossroads, the super PAC co-founded by GOP strategist Karl Rove, the National Republican Senatorial Committee and the U.S. Chamber of Commerce.

There’s more to this story. Click here to read the rest at the Center for Public Integrity.

This story is part of Buying the Senate 2014. Whether Republicans control both chambers of Congress squarely depends on Senate races in a handful of states. Click here to read more stories in this investigation.

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Copyright 2014 The Center for Public Integrity. This story was published by The Center for Public Integrity, a nonprofit, nonpartisan investigative news organization in Washington, D.C.