A truck bomb aimed at Nigeria’s electoral commission headquarters ran into barriers and failed to explode Saturday, but polls opened despite the attack for a presidential vote already shadowed by charges of fraud and a last-minute ballot hitch. In a lagoon-side slum in the sprawling city of Lagos where fishermen live in stilt houses, voters dropped their tally sheets into clear, plastic boxes. Elsewhere, electoral workers were still scrambling to unpack ballots and arrange ballot boxes. Full Story