Tens of thousands of people have turned out at a rally in Pakistan's biggest city, Karachi for former cricketer turned politician Imran Khan.
Mr Khan, who has been an established politician for many years but has struggled to win votes, has seen his support increase recently.
The BBC reports the next national elections are scheduled for 2013.
Mr Khan, who leads the Movement for Justice party, demanded strong measures to tackle corruption and called for a change in Pakistan's political culture.
One policy Mr Khan has won support for is his opposition to US drone strikes on militants inside Pakistani territory.
He also argues that foreign aid is fuelling corruption and should be stopped.