If you recall sometime back Nawaz Sahrif asked NAB (National Bureau of Accountability) to send him files of all the cases against Asif Ali Zardari, Makhdoom Amin Fahim, Raja Pervez Ashraf and other PPP leaders. Immediately after that Khursheed Shah (PPP) leader of the opposition in the parliament and other PPP leaders in the province of Sind issued statements to support the protest right of Imran Khan and Dr. Tahirul Qadari. Though the statements were not strong but the purpose was to send a signal to Nawaz Sharif that this is what will happen.
Nawaz Sharif refrain himself to move further.
Now probably PPP is given assurance their cases in NAB will not be pursued so PPP has started supporting openly to Nawaz Sharif and his government and start criticizing Imran Khan.
Zardari and PPP know about his corruption deeds during his tenure. They also know if Imran Khan came to power they will not be spared. So at any cost they would like to save this system and keep it un-touched. That is why they tell you they support the constitution and the so called democracy need to be protected.
All those political parties who get the benefit from the present system which is a product of the present constitution do not want to change it.
GEO TV channel supports Nawaz Sharif and similar forces who want to keep the status quo. Unfortunately, some of the TV anchors do not understand that constitution is there to serve the people of Pakistan not the other way round.
Some of our political leaders also due to their personal interests they support the status quo. Others due to their ignorance.
Now you can see where the present political movements stand and where Imran Khan wants take Pakistan.
It is a long journey but if the determination is there caravan can reach to its destination.