While Governor of Arkansas, Bill Clinton, with the help of Hillary, was involved in a cocaine smuggling operation and that he's had upwards of 60 people assassinated for threatening to reveal his secrets or for just generally annoying him.
Who's to Blame:
Richard Scaife, a billionaire who really, really hated Bill Clinton.
Scaife was really unhappy about Bill Clinton being president. And not in the "I'll voice my displeasure with his administration with a rant in the comments section of this YouTube video about kittens" way. He preferred the "I'll invest millions of my dollars in a campaign to discredit him" method.
"This is the best possible way I can spend my money!"
So Scaife created the Arkansas Project, which ran a series of investigations designed to damage and ultimately end Clinton's presidency. A lot of what they looked into was legitimate, or at least believable: shady real estate deals, Bill's raging libido, and so on. And then, there was the suicide of Vince Foster, and they took the project to a new, crazy level.
Vince Foster was the White House Counsel (legal guy) who turned up dead. Three separate investigations ruled it a suicide, but members of the Arkansas Project produced a 1994 film that suggested, with the help of sinister music and shadowy witnesses, the Clintons were responsible for the murder of Foster and many more, killing anyone who was getting too close to their secret, drug-fueled past.
Well he certainly looks like a Soprano in this picture...
So, Why Do People "Believe" It?
Vince Foster's death became a huge talking point in Republican circles, fueling speculation about Clinton abusing his power. More importantly, it got people talking about the legitimate, non-fake scandals Foster was connected to, which ended up damaging the Clintons' image. And once something works in politics, you don't drop it until your dying breath. Or until the election is over.