In September 2014, Darrell West published a Billionaire Political Power Index based on his Brookings Institution Press book, Billionaires: Reflections on the Upper Crust. It examined the political influence individuals of great wealth, ranking their power based on a number of factors including campaign expenditures, activism through nonprofit organizations and foundations, holding public office, media ownership, policy thought leadership, and behind-the-scenes influence.

He has updated this index to account for billionaires' more recent election activism, campaign donations, and influence leading up to the 2014 midterms. There are several individuals who have moved up the list: Peter Thiel, Bob Mercer, Joe Ricketts, Paul Singer, Jim Simons, and David Geffen. Others have seen their rankings drop: Penny Pritzker, Warren Buffett, Peter Peterson, Donald Trump, and Alice Walton.

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# Names
1 Charles & David Koch
2 Michael Bloomberg
3 Tom Steyer
4 Sheldon Adelson
5 Rupert Murdoch
6 John "Joe" Ricketts
7 Robert "Bob" Mercer
8 Paul Singer
9 Peter Thiel
10 George and Jonathan Soros
11 John and Laura Arnold
12 Bill and Melinda Gates
13 Family of the late Peter Lewis
14 Mark and Priscilla Zuckerberg
15 Warren Buffett
16 Jeff and MacKenzie Bezos
17 Pierre and Pamela Omidyar
18 James "Jim" Simons
19 David Geffen
20 Penny Pritzker
21 Marc Andreessen
22 Peter Peterson
23 Donald Trump
24 Alice Walton
U.S. Billionaire Political Power Index: America's Billionaires ranked By Overall Political Influence

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The findings, interpretations and conclusions posted on are solely those of the authors and not of The Brookings Institution, its officers, staff, board, funders, or organizations with which they may have a relationship.

Interactive created by Kevin Hawkins.