PML-N chief Nawaz Sharif called on people to back his movement to oust the ruling coalition following Prime Minister Yousuf Raza Gilani's refusal to resign after his conviction by the Supreme Court.
The opposition party organised the first rally of its campaign at the historic town of Taxila, with Sharif saying the government was too stubborn to accept logic and only understands the language of the "boot".
He described the PML-N's movement as a "war to save the Supreme Court" and accused the PPP's top leadership of being involved in corruption.
"Prepare for the long march," Sharif told a gathering of about 15,000 people.
He accused President Asif Ali Zardari, the head of the PPP, of going against the Charter of Democracy which the two parties had signed in 2006.
He urged the people to join hands with the PML-N in its campaign against the corrupt government.
"(Zardari) was not sincere in implementing the CoD and that's why we parted ways with the PPP," Sahrif said, referring to the PML-N's short-lived coalition with the PPP after the 2008 general election.
Sharif accused the PPP of being "devious" in its dealings and said the party could not be trusted.
"The government even backtracked on the restoration of judiciary, only we made it possible with our long march," he added.
The apex court convicted Gilani of contempt and gave him a
symbolic sentence of less than a minute on April 26 for refusing to act on orders to revive graft cases against Zardari in Switzerland.
Gilani has rejected demands from opposition parties like the PML-N to resign, saying only the Speaker of the National Assembly could disqualify him.
Sharif said he would not rest till the money that was allegedly laundered in Switzerland by Zardari is brought back to Pakistan.
He also highlighted the achievements of his government, including the 1998 nuclear tests.
Other senior PML-N leaders like Leader of Opposition Chaudhry Nisar Ali Khan also criticised the Pakistan Tehrik-e-Insaf party led by Imran Khan.
"Those who talk about bringing about a revolution won't bring in any revolution, they can only bring agony. Ask them what their policy is about Kashmir, workers, farmers and the US," he said.
Islamabad: Pakistan's main opposition party, PML-N, on Saturday launched a campaign against the PPP-led government calling for its ouster and said the regime was "too stubborn" and only understands the language of the "boot".
First Published: Saturday, May 05, 2012, 22:11