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President Bashir looks set to extend 25 years in power
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Main opposition, activists have called for boycott
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Youth groups call for change, many voters unconvinced
By Shadi Bushra
KHARTOUM, April 19 (Reuters) - When the Arab Spring uprisings burst out four years ago, Bedreldin Mohamed believed that, finally, many of his Sudanese countrymen would join him in calling for an alternative to President Omar Hassan al-Bashir, now in his 25th year in power.