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Supporters wave flags and cheer as they listen to Imran Khan, chairman of the Pakistan Tehrik e Insaf (PTI) party, during an election campaign rally on May 05, 2013 in Faisalabad, Pakistan. Pakistan's parliamentary elections are due to be held on May 11. (Photo by Daniel Berehulak/Getty Images) ( 168102430 )

Policemen stand guard near supporters of the Pakistan Muslim League - Nawaz (PML-N) party during an election campaign rally in Islamabad May 5, 2013. Pakistan's general elections will be held on May 11. REUTERS/Mian Khursheed ( PAKISTAN-ELECTION/ )

Supporters watch Maryam Nawaz Sharif, daughter of former Prime minister Nawaz Sharif, of the political party Pakistan Muslim League-N (PMLN), speak during an election campaign rally on May 04, 2013 in Lahore, Pakistan. Pakistan's parliamentary elections are due to be held on May 11. (Photo by Daniel Berehulak/Getty Images) ( 168018448 )

Supporters of an independent Pakistani election candidate participate in a waterborne rally to highlight the challenges faced by their embattled fishing community in the Arabian Sea off the coast of Karachi, Pakistan on Friday, May 3, 2013. Backers of independent political candidate Haji Usman Ghani took to the water Friday on a flotilla of fishing boats in the run up to the May 11, 2013 vote which will mark the first time that a democratically elected civilian government has finished a full term and handed over power to another such government in Pakistan. (AP Photo/Fareed Khan) ( Pakistan Rally at Sea )

Supporters of a Pakistani election candidate participate in a waterborne rally to highlight the challenges faced by their embattled fishing community in the Arabian Sea off the coast of Karachi, Pakistan on Friday, May 3, 2013. Backers of independent political candidate Haji Usman Ghani took to the water Friday on a flotilla of fishing boats in the run up to the May 11, 2013 vote which will mark the first time that a democratically elected civilian government has finished a full term and handed over power to another such government in Pakistan. (AP Photo/Fareed Khan) ( Pakistan Rally at Sea )

Supporters of Pakistan Muslim league Functional (PML-F) shower rose petals on candidate of national assembly Kamran Tessori (C) during an election campaign in Karachi on May 4, 2013. A Pakistani candidate running for parliament in next week's historic election was injured on Saturday as his vehicle hit a roadside bomb in the troubled northwest, officials said. ASIF HASSAN/AFP/Getty Images ( 519466770 )

Supporters of Pakistan Muslim league Functional (PML-F) march on camels as part of an election campaign in Karachi on May 4, 2013. A Pakistani candidate running for parliament in next week's historic election was injured on Saturday as his vehicle hit a roadside bomb in the troubled northwest, officials said. ASIF HASSAN/AFP/Getty Images ( 519466891 )

Maryam Nawaz (R), daughter and Kulsoom Nawaz (L) wife of former Pakistan's premier Nawaz Sharif wave to supporters as they take part of election campaign in Lahore on May 4, 2013. A Pakistani candidate running for parliament in next week's historic election was injured on Saturday as his vehicle hit a roadside bomb in the troubled northwest, officials said. AFP/Getty Images ( 519466533 )

Supporters wave flags and cheer as they watch Imran Khan, chairman of the Pakistan Tehrik e Insaf (PTI) party, arrive during an election campaign rally on May 05, 2013 in Faisalabad, Pakistan. Pakistan's parliamentary elections are due to be held on May 11. (Photo by Daniel Berehulak/Getty Images) ( 168102105 )

Punjab police commandos flank Imran Khan, chairman of the Pakistan Tehrik e Insaf (PTI) party, as he addresses supporters during an election campaign rally on May 05, 2013 in Faisalabad, Pakistan. Pakistan's parliamentary elections are due to be held on May 11. (Photo by Daniel Berehulak/Getty Images) ( 168102104 )

Supporters wave flags and cheer as they watch Imran Khan, chairman of the Pakistan Tehrik e Insaf (PTI) party, arrive during an election campaign rally on May 05, 2013 in Faisalabad, Pakistan. Pakistan's parliamentary elections are due to be held on May 11. (Photo by Daniel Berehulak/Getty Images) ( 168102108 )

Pakistani villagers listen to an activist from the Association for Gender Awareness & Human Empowerment lecturing about the benefits of voting in Mateela village near Sargodha, Pakistan on April 29, 2013. As the country gets set to vote in the upcoming nationwide election that will see a transfer of power from one civilian government to the next -- a first for Pakistan -- women still face an uphill battle to make their voices heard in the political process. (AP Photo/Rebecca Santana) ( Pakistan Women Voters )

Supporters of Imran Khan, a Pakistani cricket legend and chairman of Pakistan Tehreek-e-Insaaf (PTI) or Movement for Justice party, gather during a election campaign rally in Charsadda on May 4, 2013. A Pakistani candidate running for parliament in next week's historic election was injured on Saturday as his vehicle hit a roadside bomb in the troubled northwest, officials said. A Majeed/AFP/Getty Images ( 519466181 )

Supporters of the political and religious party Jamaat-e-Islami listen to the speeches of their leaders during an election campaign rally in Karachi May 5, 2013. Pakistan's general election will be held on May 11. REUTERS/Akhtar Soomro ( PAKISTAN/ )

A Pakistani police van drives down the road during a strike in Karachi on May 5, 2013, a day after a bomb explosion near an office of the Muttahida Qaumi Movement (MQM). Three people were killed and 35 others wounded in twin bomb blasts near a local party office in the southern city of Karachi late Saturday, police said, ahead of next week's historic elections. ASIF HASSAN/AFP/Getty Images ( 519482963 )

Supporters of Pakistan Tehreek-e-Insaaf (PTI) or Movement for Justice party take part in an election campaign rally in Lahore on May 5, 2013. A roadside bomb exploded at an election rally in southwest Pakistan on Sunday killing two people, officials said as violence continued ahead of historic polls on Saturday. Arif Ali/AFP/Getty Images ( 519492539 )

Supporters of Pakistan Tehreek-e-Insaaf (PTI) or Movement for Justice party wave party flags at the election campaign in Lahore on May 5, 2013. A roadside bomb exploded at an election rally in southwest Pakistan on Sunday killing two people, officials said as violence continued ahead of historic polls on Saturday. Arif Ali/AFP/Getty Images ( 519492253 )

Supporters of Pakistan Muslim League-N party cheer their leader, Nawaz Sharif, not pictured, during an election campaign rally in Islamabad, Pakistan, Sunday, May 5, 2013. Pakistan is scheduled to hold parliamentary elections on May 11, the first transition between democratically elected governments in a country that has experienced three military coups and constant political instability since its creation in 1947. (AP Photo/Anjum Naveed) ( Pakistan Elections )

A supporter of the political and religious party Jamaat-e-Islami takes pictures with a mobile phone as he holds Pakistan's national flag during an election campaign rally in Karachi May 5, 2013. Pakistan's general election will be held on May 11. REUTERS/Akhtar Soomro ( PAKISTAN/ )

Supporters wave towards a helicopter transporting Pakistan Tehreek-e-Insaf's (PTI) Chief Imran Khan as he leaves after his election campaign rally in Nowshera, Khyber Pakhtunkhwa province May 4, 2013. Pakistan's general elections will take place on May 11. REUTERS/Fayaz Aziz ( PAKISTAN/ )