ProPublica - "How Dark Money Helped Republicans Hold the House and Hurt Voters"

In the November election, a million more Americans voted for Democrats seeking election to the U.S. House of Representatives than Republicans. But that popular vote advantage did not result in control of the chamber. Instead, despite getting fewer votes, Republicans have maintained a commanding control of the House. Such a disparity has happened only three times in the last century.
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Republican strategist Karl Rove laid out the approach in a Wall Street Journal column in early 2010 headlined "He who controls redistricting can control Congress."

The approach paid off. In 2010 state races, Republicans picked up 675 legislative seats, gaining complete control of 12 state legislatures. As a result, the GOP oversaw redrawing of lines for four times as many congressional districts as Democrats.

How did they dominate redistricting? A ProPublica investigation has found that the GOP relied on opaque nonprofits funded by dark money, supposedly nonpartisan campaign outfits, and millions in corporate donations to achieve Republican-friendly maps throughout the country. Two tobacco giants, Altria and Reynolds, each pitched in more than $1 million to the main Republican redistricting group, as did Rove's super PAC, American Crossroads; Walmart and the pharmaceutical industry also contributed. Other donors, who gave to the nonprofits Republicans created, may never have to be disclosed.