Eugene V. Debs ran under Socialist ticket in 1900,1904,1908,1912 and 1920.
In the 1928 US presidential election, Norman Thomas was nominated as the Socialist Party presidential candidate and Verne L. Reynolds was nominated as the Socialist Labor candidate. The main presidential candidates were Republican Herbert Hoover and Democrat Al Smith.
William Howard Taft was a Republican.
Assuming you are asking about the US, Fred Halstead was the Socialist Workers Party candidate in the 1968 Presidential election.
William Jennings Bryan (1896, 1900 and 1908)
That candidate was US President William "Bill" Jefferson Clinton, in the year 1992.
John McCain
Eugene V. Debs ran on the Socialist Party of America ticket five times and never won.
by sighning a contract or run
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EDWARD KENNEDY Eugene V. Debs ran on the Socialist Party of America ticket five times and never won.
Foreign born people are not eligible to be president in the US , so they can not be serious candidates.