Sen. Elizabeth Warren of Massachusetts trumpeted the support of an alleged serial predator in a list of 200 Obama alumni who have backed her presidential campaign.

On the list is "Edward B.P. Buck." Ed Buck, 65, whose full name is Edward Bernard Peter Buck, was arrested in September on charges of three counts of battery causing serious injury, administering methamphetamine, and maintaining a drug house in Los Angeles, California. Federal authorities also charged Buck with one count of distribution of methamphetamine resulting in death.

"This was a mistake considering Ed Buck was not staff or an alum. This was put together via Google Docs by some Obama alums, and they caught some nonstaff that populated the list, but obviously, they missed one. They are removing it," Warren spokesman Chris Hayden told the Washington Examiner.

Alleged victims of Buck told investigators that he would prey on black men with the promise of free drugs to lure them back to his home in Los Angeles. There, Buck would drug the victims against their wishes and sexually assault them. Buck, a major Democratic Party megadonor, has supported a number of past candidates, including President Barack Obama, Hillary Clinton, and California Reps. Ted Lieu and Adam Schiff.

Linking via Twitter to an article about the endorsements, Warren said, "I'm grateful to have the support of these Obama campaign alumni and my fellow Obama administration alumni. Their work changed what we know is possible in our politics. Together, we can win in 2020 and build a government that works for everyone."

In July 2017, Gemmel Moore, 26, who was homeless and working as a prostitute, fatally overdosed. Moore wrote in his journal that he blamed Buck for his out-of-control drug habit. “I’ve become addicted to drugs and the worst one at that,” Moore wrote. “Ed Buck is the one to thank, he gave me my first injection of crystal meth.”

In January this year, Timothy Dean, 55, was found dead in Buck’s home. Buck’s attorney, Seymour Amster, said at the time that the man ingested drugs before coming to the megadonor’s residence.

Buck delayed for 15 minutes before calling paramedics after Dean died, according to an autopsy report. That was disputed by Buck, who said he was in another room taking a shower when Dean fell unconscious.

“From what I know, it was an old friend who died of an accidental overdose, and unfortunately, we believe that the substance was ingested at some place other than the apartment,” his lawyer said. Dean's sister, Joyce Jackson, described Buck as a predator. "I really believe he preyed on people. I think he’s sick. He really needs to get some help," she said.

Prosecutors touched on the two deaths in court documents, writing, “Not deterred by the senseless deaths of Moore and Dean, [Buck] nearly killed a third victim last week.”

In the motion requesting bail be set at $4 million, prosecutors called Buck “a violent, dangerous sexual predator” who “mainly preys on men made vulnerable by addiction and homelessness.”

One individual told investigators in horrifying detail about the alleged terror Buck would inflict on his victims.

"Buck then became frustrated and obtained a power saw from a closet, turned it on, and approached Victim 7 with it," a criminal filing states.

If convicted of the charges, Buck could face more than five years in state prison.

Buck made his millions in the 1980s while living in Arizona after buying an information services company out of bankruptcy. He then began bankrolling a number of political initiatives, starting with leading the impeachment charge against former Arizona Gov. Evan Mecham. In 1989, he was crowned the grand marshal of the International Gay Rodeo.

Buck moved to a gay neighborhood of West Hollywood, Los Angeles, two years later and started funding the campaigns of various Democrats at the local, state, and national levels. Since the 1990s, Buck has donated over half a million dollars to Democratic candidates.

But as he was cutting checks to prominent Democratic politicians, Buck was allegedly engaged in a twisted game of manipulating some of the city's most vulnerable.