Catholic cardinal quits amid sex scandal

VATICAN CITY, VATICAN - FEBRUARY 19: Cardinal Keith O'Brien, archbishop of Saint Andrews and Edinburgh attends a mass held by pope Benedict XVI in St. Peter's Basilica on February 19, 2012 in Vatican City, Vatican. The 84 year old Pontiff installed 22 new cardinals during his fourth concistory, who will be responsible for choosing his sucessor. (Photo by Franco Origlia/Getty Images)
VATICAN CITY, VATICAN - FEBRUARY 19: Cardinal Keith O'Brien, archbishop of Saint Andrews and Edinburgh attends a mass held by pope Benedict XVI in St. Peter's Basilica on February 19, 2012 in Vatican City, Vatican. The 84 year old Pontiff installed 22 new cardinals during his fourth concistory, who will be responsible for choosing his sucessor. (Photo by Franco Origlia/Getty Images)

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Scotland's Cardinal Keith O'Brien has resigned amid allegations of sexual misconduct. CNN's Becky Anderson reports.