A Pakistani man walks past posters of former Prime Minister Nawaz Sharif, the Pakistan Muslim League-N party chief, on display on the party's office building in Lahore, Pakistan, on Sunday, May 12, 2013. (AP Photo/Anjum Naveed)

Photo by: Anjum Naveed

A Pakistani man walks past posters of former Prime Minister Nawaz Sharif, the Pakistan Muslim League-N party chief, on display on the party's office building in Lahore, Pakistan, on Sunday, May 12, 2013. (AP Photo/Anjum Naveed)