The Koch brothers used their massive fortune to power a conservative crusade that reshaped American politics

David Koch ran as the vice-presidential candidate for the Libertarian party in 1980, attacking campaign donation limits and calling for the repeal of laws criminalizing drug use and homosexuality. The loss compelled him to reevaluate his political approach, planting the seeds for the extensive donor network.

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The Koch brothers founded Americans for Prosperity in 2004, now one of the most influential conservative political organizations. It counts more than 700 wealthy donors in its ranks and has chapters in 36 states. Its influence is only rivaled by the Republican Party.

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The Koch Brothers were credited with financially aiding the rise of the Tea Party movement, which wrested control of the House for Republicans in the 2010 midterms at the tail end of President Barack Obama's first term.

The Kochs backed the American Legislative Exchange Council, an organization of conservative state lawmakers and business lobbyists. They've drafted "model legislation" that lawmakers have introduced to cut taxes, weaken environmental protections, and promote other conservative ideas. More than 600 of them have become law across the US.

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The Kochs have used their network to support academic programs and centers at colleges across the nation that teach conservative economic principles and theories. Its generated controversy from critics who argue it gives conservative organizations too much power in hiring and firing professors and researchers.

As key players in the fossil fuel industry, the Koch brothers staunchly opposed efforts to fight climate change and have downplayed its risks. After the Supreme Court's decision in Citizens United in 2011, the Kochs unleashed a wave of political advertising to elect Republicans who wouldn't pass new environmental regulations.

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During the 2016 presidential election, the Koch network spent around $750 million, putting it almost on par with the amount spent by the Republican Party. But the Kochs didn't back Trump, and they've been critical of his policies on trade and immigration.

The Kochs ramped up their political efforts during the 2018 midterms, vowing to spend up to $400 million to support conservative candidates . But they lost many of their races and Democrats recaptured the House, exposing limits to their influence.

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The Kochs were key supporters of the First Step Act, a bipartisan criminal justice legislation that became law earlier this year. It was aimed at reducing recidism rates among federal prisoners, expanding early-release programs and modifying sentencing laws.