We were right, here at La Maison. It's shaping up as a $2,000,000,000 ad campaign (sorry, presidential election) at the very least.

Politico (just the juicy bits; my emphasis):

Republican super PACs and other outside groups shaped by a loose network of prominent conservatives – including Karl Rove, the Koch brothers and Tom Donohue of the U.S. Chamber of Commerce – plan to spend roughly $1 billion on November’s elections for the White House and control of Congress[.] ...