Americans for Prosperity is a 501(c)(4) nonprofit group that ostensibly focuses on social welfare. It is one of the most prominent groups within the Koch network, with a claimed volunteer base of 2.3 million people. The group was founded in 2004 with a large donation from David Koch, as well as funds from prominent companies including State Farm and Johnson & Johnson. Today, Koch serves as chairman of AFP’s board. The group’s president, Tim Phillips, previously served as a vice president of Enron lobbyist Century Strategies.
Americans for Prosperity ramped up quickly in the early years of the Obama Administration. From 2007 to 2010, its budget expanded from $7 million to $40 million; by 2012, the budget had ballooned to $122 million. In 2014, the group estimated that it would spend $125 million on the midterm elections that year. Politico noted that this “projected budget for Americans for Prosperity would be unprecedented for a private political group in a midterm, and would likely rival even the spending of the Republican and Democratic parties’ congressional campaign arms.” By March 31 of that year, the group had already spent over $16 million in Senate races and $30 million total. AFP was active not only in running ads, but in collecting data and in deploying field staff as well.
In August 2015, AFP announced that it would air $1 million of ads against Governor (and now Senate candidate) Maggie Hassan (D-NH) and $1.4 million worth of ads against Senate candidate Ted Strickland (D-OH).
 “David Koch seeded major tea-party group, private donor list reveals.” Alex Seitz-Wald, National Journal, 09/24/13
 “Bush 2000 advisor offered to use clout to help Enron.” Joe Stephens, The Washington Post, 02/17/02
 “Americans for Prosperity – Tim Phillips, President.” Accessed 10/08/15
 “Billionaire brothers’ money plays role in Wisconsin dispute.” Eric Lipton, The New York Times, 02/21/11
 “READ IN: Monday, March 31: ACA deadline looms, Koch strategist hits Harry Reid in ad, charting AFP Senate spending.” Reid Wilson, The Washington Post, 03/31/14
 “Conservative group launches $1 million TV ad buy to criticize Hassan on budget veto.” John DiStaso, WMUR 9 New Hampshire, 08/06/15
 “AFP launches TV attacks on Strickland. Are they the start of another big campaign?” Andrea Drusch, National Journal, 08/19/15