Sir: Seven Pakistan Muslim League-Nawaz (PML-N) candidates’ abandonment of the party on the final day of symbol allotment is further evidence of pre-poll rigging. Such politicians are professional chameleons who change their political affiliation in chaotic times like elections simply to safeguard their own interests. It is because such a culture has been tolerated and allowed to flourish that our political system is so corrupt today. All political parties must take a stand here. It is the PML-N which is suffering today at the hands of these turncoats, but tomorrow it could be any other party. Unfortunately, it seems like short-sighted greed will prevail as always. SHAHID IKHLAQ Multan Published in Daily Times, July 3rd 2018.