Bill Clinton, with Hillary Clinton, campaigns for governor of Arkansas in 1978. (The Washington Post)

Inside The Clinton Donor Network is an effort to identify every known donor who contributed to support Bill and Hillary Clinton over their four decades in public life.

The findings come from Arkansas fundraising records; federal campaign finance data from the Federal Election Commission and the nonpartisan Center for Responsive Politics; legal defense fund contributions compiled by Political MoneyLine; and donor information disclosed by the Bill, Hillary and Chelsea Clinton Foundation. Historical documents and photographs were provided by the Butler Center for Arkansas Studies, the University of Arkansas Library, Kate Johnson at the Clinton House Museum in Fayetteville and Ernest Dumas.

The findings were also drawn from interviews with more than 100 Clinton contributors, fundraisers and aides.

In all, The Washington Post identified donations from roughly 336,000 individuals, corporations, unions and foreign governments who have supported the Clintons’ political or philanthropic endeavors.

The Post database includes publicly reported donors to Bill Clinton’s 1974 congressional campaign, his attorney general and gubernatorial races in Arkansas, his 1992 and 1996 presidential campaigns, the Democratic National Committee from 1991 through 1996, Hillary Clinton’s 2000 and 2006 Senate campaigns, her leadership PAC, her 2008 and 2016 presidential campaigns and three super PACs set up to support her current White House bid.

The database also includes individual and corporate donors to the 1992 and 1996 Democratic convention host committees. Those nonprofit committees were audited by the Federal Election Commission as part of its examination of presidential primary campaigns.

In addition, the database includes donors who gave $500 or more to a legal defense fund set up in 1998 to support the Clintons.

Lastly, the database includes donors who gave at least $250 to the Clinton Foundation through June 2015. Since the foundation reports donations in ranges, The Post used the minimum possible amount in its calculations for individual donors. In a handful of cases, contributors provided exact totals.

Not all donation records were available — there is only partial data for Bill Clinton’s races in Arkansas.

Also, because of inconsistencies in the data sets, individual contribution totals may be undercounted.

For the most part, the database does not include donors to federal races who gave $200 or less because their names are not required to be reported to the FEC. The database also does not include hundreds of millions donated to the DNC after Bill Clinton’s reelection in 1996, since those funds were not used to support his elections.

Totals for individual corporations and unions reflect direct donations by the entity or its PAC. Union donations do not include independent expenditures or communications to members. Corporate totals have been aggregated to include predecessor companies, subsidiaries and mergers.

Industry-sector totals reflect donations by corporations, their PACs and their employees. Industry coding was provided by the Center for Responsive Politics and augmented by The Post. Because of incomplete information provided by some donors, industry coding was not available for all itemized donations.

To calculate the total raised by the Bush family over three generations, The Post tallied all state and federal campaign fundraising by George H.W. Bush, George W. Bush, Jeb Bush and George P. Bush from 1988 through 2015, as well as Republican National Committee fundraising from 1987 through 1992 and from 1999 through 2004. (Records for George H.W. Bush’s earlier campaigns and those of Prescott Bush are not available from the FEC, which did not exist at that time.) In addition, The Post used tax records to calculate the fundraising of six Bush charitable foundations.

Explore the full project here.