Pakistani opposition leader Nawaz Sharif, who was banned from taking part in last week's elections because of criminal convictions, is planning to contest the by-elections.
Several hurdles stand in his way. But if he can overcome them, Sharif may plant himself in the running for the prime minister's slot in the new government.
Pakistan will hold by-elections in the coming weeks for seats left vacant either because a candidate died or because a politician won in more than one constituency. 
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CNN's Zein Basravi contributed to this report.
All About Pakistan • Pervez Musharraf • Nawaz Sharif • Benazir Bhutto