WATCH: Tuesday's U.S. Midterm Election Will Be the Most Expensive Ever

Dark money from outside, non-disclosed sources have poured into races across the United States adding up to a total sum of $4 billion - with North Carolina's Senate race being the most expensive single race.

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WASHINGTON AP -- Total spending in North Carolina's tight Senate race topped $100 million on Wednesday, making it the first such contest in the nation to cross that threshold, according to the nonpartisan Sunlight Foundation data.

Roughly 70 cents of every dollar has come outside groups looking to influence the race between endangered Democratic incumbent Sen. Kay Hagan and her Republican challenger, state House Speaker Thom Tillis. The heavy spending puts the state atop the list of costly races with less than week before Election Day.

The next most costly state was Colorado, with more than $86 million spent. Iowa follows with $78 million and Kentucky with $72 million.

Hagan has spent almost $19 million through Sept. 30, her most recent disclosure available with the Federal Election Commission. Tillis has spent almost $8 million through Oct. 15, his most recent filing. Candidates who unsuccessfully sought the GOP nomination account for the balance of the candidate spending.

But it's the outside groups who have accounting for the bulk of the spending. The Democratic-backing Senate Majority PAC has spent almost $10 million and the party's Democratic Senatorial Campaign Committee has run about $9 million. The National Republican Senatorial Committee has spent almost $9 million, as well, and the business-backed U.S. Chamber of Commerce has spent $4 million.

In total, outside groups account for $72 million of the race's spending.

More than half of the spending has gone toward television ads. Each side has spent roughly $27 million on ads, according to the nonpartisan Center for Public Integrity's analysis of ad-tracking firm Kantar/CMAG data.

The nonpartisan Sunlight Foundation has been tracking spending by candidates and their allies, based their campaign finance reports. The numbers omit spending from nonprofit groups such as Americans for Prosperity, the organization backed by billionaire brothers Charles and David Koch.

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