Approximately 1,600 donors to Democratic presidential candidates donated more than $200 to more than one candidate, according to a BuzzFeed analysis.

Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.) had the most donors who also gave to at least one other candidate, the analysis showed. More than 700 donors gave to both her and another candidate, with 170 giving more than $200 to both Harris and South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield MORE, while about 166 also gave to Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE’s (D-N.J.) campaign, according to BuzzFeed.

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The analysis also found a large overlap between Buttigieg’s donors and those of former Texas Rep. Beto O’Rourke (D), as well as between Sens. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) and Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.)

Warren and Sanders have staked out similar territory on the left flank of the 2020 candidates, with both endorsing progressive causes like "Medicare for All."

Sanders had the largest number of disclosed donors of the candidates in the first quarter, of which only 300 donated to another candidate, according to BuzzFeed’s analysis. Booker only reported about a third as many donors, but also had about 300 who donated elsewhere, according to BuzzFeed.

The analysis does not include donors who contributed $200 or less, which campaigns are not required to report, and did not include former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE, who has led most polls of the field but has not yet formally declared his candidacy and thus has not officially raised any campaign cash, according to BuzzFeed.

Sanders currently leads fundraising among Democratic candidates, having raised $18.2 million, followed by Harris with $12 million. Eighty-four percent of Sanders’s total was from donors giving under $200.

Buttigieg's campaign declined to comment. Other candidates' campaigns did not immediately respond to a request for comment from The Hill.