Question: What is the seed money lender of Catalist's net worth as of May 2017?

full_context: Document 1: Michael Bloomberg: Michael Rubens "Mike" Bloomberg (born February 14, 1942) is an American businessman, author, politician, and philanthropist. His net worth is estimated at US$ 53.4 billion, as of July 2017, ranking him as the 6th richest person in the United States and the 10th richest person in the world. He has joined The Giving Pledge, whereby billionaires pledge to give away at least half of their wealth.
Document 2: Li Ka-shing: Sir Ka-shing Li, GBM, KBE, JP (born 29 July 1928 in Chaozhou, China) is a Hong Kong business magnate, investor, and philanthropist. As of September 2017, Li is one of the wealthiest people in Asia, with an estimated net worth of US$34.4 billion. He is currently the chairman of the board for CK Hutchison Holdings; through it, he is the world's leading port investor, developer, and operator, and the largest health and beauty retailer in Asia and Europe.
Document 3: Open Society Foundations: Open Society Foundations (OSF), formerly the Open Society Institute, is an international grantmaking network founded by business magnate George Soros. Open Society Foundations financially support civil society groups around the world, with a stated aim of advancing justice, education, public health and independent media.
Document 4: United States House Select Committee to Investigate Tax-Exempt Foundations and Comparable Organizations: United States House Select Committee to Investigate Tax-Exempt Foundations and Comparable Organizations
Document 5: Priorities USA Action: Priorities USA Action is the largest Democratic Party super PAC. Founded in 2011, it supported Barack Obama's 2012 re-election campaign. It was the primary super PAC supporting Hillary Clinton's 2016 presidential campaign. It focused mainly on high-dollar donors. As of September 2016, it had amassed $132 million in support of Clinton. The top six donors to the super PAC have given $43.5 million, which is a third of the money collected by Priorities USA Action in the 2016 election cycle. The super PAC raised $21.7 million in August 2016, marking its largest monthly fundraising haul.
Document 6: Carlos Slim: Carlos Slim Helú (] ; born January 28, 1940) is a Mexican business magnate, investor, and philanthropist. From 2010 to 2013, Slim was ranked as the richest person in the world. He derived his fortune from his extensive holdings in a considerable number of Mexican companies through his conglomerate, Grupo Carso.
Document 7: Catalist: Catalist is a for-profit corporation based in Washington D. C. that operates a voter database. It was founded in 2006 by Harold M. Ickes with seed money from George Soros. It specializes in microtargeting for Democratic political campaigns.
Document 8: NGP VAN: NGP VAN is a privately owned American company specializing in helping progressive campaigns and organizations leverage technology to meet their goals. In 2009, the company was the largest partisan provider of campaign compliance software, used by most Democratic members of Congress. The company's services have been utilized by clients such as the Obama 2008 presidential campaign, the Obama 2012 presidential campaign, the Bernie Sanders 2016 presidential campaign, the Hillary Clinton 2016 presidential campaign, the British Liberal Democrats, and the Liberal Party of Canada. Its current president and CEO, Stuart Trevelyan, was a veteran of the 1992 Clinton-Gore "War Room", providing research, analysis, and whip counts to the Clinton Administration as a member of the White House Office of Legislative Affairs.
Document 9: Verrit: The website's slogan says it is "media for the 65.8 million," referring to the number of votes Hillary Clinton won in the 2016 presidential election. Daou, an adviser to Clinton's 2008 presidential campaign, and prior chief executive of Shareblue told "Business Insider" that he intended the website to "reflect the worldview" of those who voted for Clinton and described the site as an "online hub for Clinton backers so that they can find easy-to-share facts, stats and other information you can take out to social media when you’re having debates on key issues people are discussing". Daou also said the website had no financial ties to Clinton.
Document 10: George Soros: George Soros ( or ; Hungarian: "Soros György" , ] ; born György Schwartz, August 12, 1930) is a Hungarian-American investor, business magnate, philanthropist, and author. Soros is one of the world's most successful investors. As of May 2017, he had a net worth of $25.2 billion, ranking among the 30 richest people in the world.
Document 11: Citizens' Climate Lobby: Citizens' Climate Lobby (CCL) is an international grassroots environmental group that trains and supports volunteers to build relationships with their elected representatives in order to influence climate policy. The CCL is a registered 501(c)(4) with approximately $300 thousand in revenue in the United States in 2015. Operating since 2007, the goal of CCL is to build political support across party lines to put a price on carbon, specifically a revenue neutral carbon fee and dividend (CF&D) at the national level. CCL is supported by notable climate scientists James Hansen, Katharine Hayhoe, and Daniel Kammen. CCL's advisory board also includes former Secretary of State George P. Shultz, former US Representative Bob Inglis, actor Don Cheadle, and RESULTS founder Sam Daley-Harris.
Document 12: Warren Buffett: Warren Edward Buffett ( ; born August 30, 1930) is an American business magnate, investor, and philanthropist. Buffett serves as the Chief Executive Officer and Chairman of Berkshire Hathaway. He is considered by some to be one of the most successful investors in the world, and as of August 2017 is the second wealthiest person in the United States, and the fourth wealthiest in the world, with a total net worth of $76.9 billion.
Document 13: Cato Institute: The Cato Institute is an American libertarian think tank headquartered in Washington, D.C. It was founded as the Charles Koch Foundation in 1974 by Ed Crane, Murray Rothbard, and Charles Koch, chairman of the board and chief executive officer of the conglomerate Koch Industries. In July 1976, the name was changed to the Cato Institute.
Document 14: Grassroots Campaigns, Inc.: Grassroots Campaigns, Inc. is a for-profit corporation that does strategic consulting, and fund raising for humanitarian and progressive causes and political organizations. Grassroots Campaigns employs thousands of workers to generate small-donor contributions, increase visibility, and expand the membership base for a number of progressive groups, issues, and campaigns. Headquartered in Boston Massachusetts, the company was founded in December 2003 by a small team of experienced organizers who specialized in grassroots-level political and public interest organizing with groups like the Public Interest Research Group.
Document 15: Paul Soros: Paul Soros (Hungarian: "Soros Pál" ; June 5, 1926 – June 15, 2013) was a Hungarian-born American mechanical engineer, inventor, businessman and philanthropist. Soros founded Soros Associates, which designs and develops bulk handling and port facilities. Soros Associates currently operates in ninety-one countries worldwide, as of 2013. Paul Soros was the older brother of George Soros, a successful businessman and financier.
ground_truth: George Soros