Vote-counting was far from over when Tanzanian opposition leader Seif Sharif Hamad was frustrated enough to call people onto the streets. As thwarted observers alleged the most blatant election fraud in the country’s history, and with no way to challenge the results in court, there was little to do but protest. As they walked toward a roundabout in the semi-autonomous region of Zanzibar on Thursday, police fired tear gas, then arrested them — Hamad's second arrest in a week.