Nigel Farage reportedly failed in a bid to get controversial ex-Tory MP Enoch Powell to endorse him in a by-election.
The Ukip leader is alleged to have sought the public backing while fighting for a seat for the fledgling party 20 years ago.
His request - and Mr Powell's refusal - were contained in letters between the pair held in a Cambridge University archive, the Daily Telegraph reported.
Mr Farage has previously declared Mr Powell his political hero and endorsed the "basic principle" of the warnings about mass immigration made in Mr Powell's notorious "rivers of blood" speech.
On Thursday he was described by comedian Russell Brand as a "pound shop Enoch Powell" as they clashed on the BBC's Question Time Show.
Although Mr Powell's cause was taken up at the time by right-wing Tories as well as dockers and meat porters, who went on strike demanding his reinstatement, few mainstream politicians have felt able to support him in subsequent decades.
According to the correspondence seen by the newspaper, the then 29-year-old Mr Farage wrote to Mr Powell in March 1994 when he was a candidate for the fledgling eurosceptic party at an election in Eastleigh.
"I have everything in place to fight a good, aggressive campaign but a voice from you could transform things and put the issue to the forefront," he is reported to have told him.
But despite being offered "transport, dinner and whatever you need", Mr Powell replied that after "very serious consideration ... I do not feel I can contribute further to the campaign by speaking on your behalf".
He told Mr Farage: "Recent developments seem to show that opinion in the United Kingdom is consolidating against membership of the European Union."
Subsequent letters from other party figures showed Mr Powell declined at least two invitations to stand as a Ukip candidate in national elections for the party but that he had provided three written endorsements, the newspaper said.
Without the public backing of his political hero, Mr Farage came fourth in Eastleigh with 952 votes - 1.7% of the total - just ahead of the Monster Raving Loony candidate.
