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 (D) will attend a fundraiser for his 2020 White House campaign next month hosted by several high-dollar Democratic bundlers who have in the past supported former President Obama and former Secretary of State Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE in their own presidential bids.

NBC News reported Thursday that Buttigieg will attend a May 21 event hosted by Steve Elmendorf and Barry Karas, two longtime Democratic donors who organized hundreds of thousands of dollars in donations for Clinton and Obama, respectively.

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Elmendorf previously announced his support for Buttigieg's presidential campaign, which officially kicked off earlier this month, and donated a small amount — $250 — to the mayor's presidential campaign last financial quarter. He previously bundled more than $100,000 for Clinton's unsuccessful 2016 White House bid and worked on former Secretary of State John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE's 2004 bid against President George W. Bush.

Karas, along with Beverly Hills lawyer Dana Perlman, supported Obama's successful campaigns in 2008 and 2012, and organized at least $500,000 in donations to the Obama campaign in 2012, according to Forbes.

Buttigieg's newfound support from major party donors comes as the South Bend mayor has surged to third place in polling of some early primary states, including Iowa, where he trails only Sen. 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 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 yet to enter the race, while leading some more nationally prominent candidates such as Democratic Sens. 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 (Calif.) and 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 (N.J.).

Invitations to next month's fundraiser in Washington for Buttigieg range from $250 to $5,600 per person, according to NBC, and the event is billed as the mayor's first visit to D.C. since launching his presidential bid.