In an election marked by record outside spending, including “dark money” sources, a clear winner has already emerged: the corporate television stations making windfall profits from political advertising.

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Cable news stations have nearly doubled their sales in political ads since the last midterm elections in 2010, according to figures from Kanta Media ad tracking firm, which were provided to Reuters. TV stations across the U.S. will bring in approximately $2.4 billion from local, state, and federal elections ads, they report. These numbers are just slightly behind the 2012 presidential election, which saw $2.9 billion spent on TV ads.

A recent Pew Research poll finds that, for local TV stations—which remain one of the sources people in the U.S. depend on most for their political news—the 2014 elections could turn out to be one of the most profitable ever.

According to Cecilia Kang and Matea Gold writing for the Washington Post: “This year’s deluge of political ads is being driven largely by super PACs and other independent groups seeking to shape the hard-fought battle over control of the U.S. Senate.”

An estimated 908,000 TV ads regarding the U.S. Senate elections aired through late October, the Center for Public Integrity reports. In seven key Senate races, dark money groups are behind 20 percent of all TV ads. A new analysis by the Wesleyan Media Project finds that only 26 percent of these Senate ads are positive.