Police in riot gear block a main boulevard leading to Independence Square, during a protest by anti-government demonstrators, in central Dakar, Senegal Tuesday, Feb. 21, 2012. Former Nigerian ... more 
Police in riot gear block a main boulevard leading to Independence Square, during a protest by anti-government demonstrators, in central Dakar, Senegal Tuesday, Feb. 21, 2012. Former Nigerian President Olusegun Obasanjo arrived in Senegal Tuesday to mediate the country's political standoff, while police once again fired tear gas to disperse rock-throwing protesters in the capital. Demonstrators are calling for the departure of 85-year-old President Abdoulaye Wade, who has defied calls to step down and is instead running for a third term in this weekend's election.(AP Photo/Rebecca Blackwell) less 
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Associated Press | Photo By Rebecca Blackwell
Wed, Feb 22, 2012 2:56 PM EST