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By Joe Brock ABUJA (Reuters) - Nigerian President Goodluck Jonathan has been told it would be "morally flawed" for him to run for re-election in 2015, in a scathing letter from his mentor and former head of state Olusegun Obasanjo. Obasanjo lays down a damning appraisal of Jonathan's leadership, chiding him on his performance on everything from corruption and insecurity to the economy, in the 18-page letter entitled 'before it is too late', seen by Reuters on Thursday. The former president even likens the current situation to the tenure of General Sani Abacha, whose five years of military rule in the 1990s were marred by human rights abuses and the looting of funds from Africa's biggest oil producer. The presidency responded by saying the comments by Obasanjo were "reckless, baseless, unjustifiable and indecorous", adding that the letter had been deliberately leaked to the media.