An examination of legal documsents and election filings, along with interviews with his acquaintances, revealed Mr. Martin, 62, to be a man with a history of scintillating if not always factual claims. He has left a trail of animosity — some of it provoked by anti-Jewish comments — among political leaders, lawyers and judges in three states over more than 30 years.

He is a law school graduate, but his admission to the Illinois bar was blocked in the 1970s after a psychiatric finding of “moderately severe character defect manifested by well-documented ideation with a paranoid flavor and a grandiose character.”

Though he is not a lawyer, Mr. Martin went on to become a prodigious filer of lawsuits, and he made unsuccessful attempts to win public office for both parties in three states, as well as for president at least twice, in 1988 and 2000. Based in Chicago, he now identifies himself as a writer who focuses on his anti-Obama Web site and press releases.