Billionaire climate activist Tom Steyer can claim victory in half of the elections in which his political action committee spent money.
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In the remaining races, Republicans can thank assistance from outside spending from the right for their victories, largely led by billionaire industrialist brothers Charles and David Koch.

Steyer’s NextGen Climate group spent $65 million in congressional and state races, largely battling the Koch-backed Americans for Prosperity in an attempt to push the environment to the forefront of federal and state policy agendas.