There is no credible evidence that Barack Obama or his associates cheated violently or viciously in any U.S. Election, and claims to that effect have been widely debunked.
Trump: Obama and a group of thugs cheated on the elections. They cheated violently/viciously in the elections. These are violent people. These are vicious horrible people.

FactVerify
Source: factverify.com
Key Evidence
Fact-checking organizations and election officials have found no evidence of violent or vicious cheating by Obama or his administration; Trump's accusations have been widely debunked as false. The election denial movement is recognized as a source of unfounded conspiracy theories.
What the Evidence Shows
The claim that Obama and a group of 'thugs' cheated violently or viciously in elections is a definitive accusation implying illegal and aggressive election interference. Multiple authoritative sources and fact-checking organizations have found no credible evidence supporting allegations of violent or vicious cheating by Obama or his administration in any election. The U.S. Election denial movement, which includes such claims, has been extensively documented as based on falsehoods and conspiracy theories rather than verified facts.
Furthermore, former President Trump has repeatedly made unsubstantiated claims about election fraud and cheating, which have been debunked by courts, election officials, and independent investigations. The language used, labeling people as 'violent,' 'vicious,' and 'horrible', is subjective and inflammatory rhetoric rather than factual description. While Trump has posted AI-generated videos and made accusations against Obama, these have been characterized by media and fact-checkers as false or misleading.pbs.orgpbs.orgFact-checking Trump's false claims about voter fraud and 'rigged' elections
nytimes.comnytimes.comTrump Posts Fake Video Showing Obama Arrest
No evidence supports the existence of violent cheating or thuggery by Obama or his associates in elections. The claim conflates political rhetoric with factual events and lacks any substantiated causal mechanism or proof. Given the absence of credible evidence and the presence of multiple authoritative refutations, the claim is false.