Rome, April 9 - Ex-premier Romano Prodi is still Italian bookmakers' top tip to become next Italian president in voting starting April 18. Despite the opposition of ex-premier Silvio Berlusconi's People of Freedom (PdL) party, the second-biggest parliamentary force, former centre-left premier Prodi is quoted at 1.65 to 1 by Bet2875. Berlusconi's long-time right-hand man Gianni Letta is second at 1.85 despite the opposition of the Democratic Party, which emerged from February elections as the top party but did not get a majority in the Senate, leading to a hung parliament. Former PD leader Massimo D'Alema is a 2-to-1 tip, Agipronews reported. D'Alema has been cited as acceptable by Berlusconi but he does not enjoy wide popularity among centre-left rank and file. Former European human rights chief Emma Bonino of the Radical Party, who would be Italy's first woman president, has come back up in the betting, to 2.1, followed closely by another former centre-left premier Berlusconi has said he might accept, Giuliano Amato, at 2.2. Ex-Senate Speaker Franco Marino, a centre-lefter with broader appeal, is on 2.45 to 1.