hˌævɪŋ stˈʊd ʌnsəksˈɛsfəli æz ɐ sˌiːpˌiːdʒˌiːbˈiː pˌɑːɹləmˈɛntɚɹi kˈændᵻdˌeɪt ɪnðə nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi θɹˈiː ɹˈɑːndə ˈiːst baɪᵻlˈɛkʃən, hˈɔːɹnɚ wʌz ᵻlˈɛktᵻd pɹˈɛzɪdənt ʌvðə sˈaʊθ wˈeɪlz mˈaɪnɚz fˌɛdɚɹˈeɪʃən ɪn nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi sˈɪks.
Having stood unsuccessfully as a CPGB Parliamentary candidate in the 1933 Rhondda East by-election, Horner was elected President of the South Wales Miners' Federation in 1936.