Until his marriage, John Mitchel had by and large taken his politics from his father who, according to Mitchel's early biographer William Dillon, had "begun to comprehend the degradation of his countrymen". Soon after the granting of Catholic emancipation in 1829, the O'Connellites challenged the Protestant Ascendancy in Newry by running a Catholic parliamentary candidate. Many members of the Rev. Mitchel's congregation took an active part in the elections on the side of the Ascendancy, and pressed the Rev. Mitchel to do the same. His refusal to do earned him the nickname "Papist Mitchel."