So many PPP gatherings were attacked by the terrorists, ANP leadership was targeted and many leaders were killed, so realistically ppp and anp couldn't even campaign for 2013 elections, they were not held on fair grounds.
Pti and Pmln freely campaigned. Pmln called them our brothers and we are one. These both parties were also against military operations whilst ppp and Anp were pro operations. Thankfully the operations were a success and we reduced terrorist attacks.
Ppp, Anp, Mqm, JUP, sunni ittehad council, Tlp (wasn't official party then) PAT were all anti terrorism parties, they all were targeted by TTP, look at how many sunni masjids and darbars were targeted. MWM is another party who was anti TTP.
Whilst Pmln, Pti, Jui, JI, LJ, SSP, ASWJ, TJ, and all pro terrorist party got away with it.
After Benazir killing, it was game over for General Musharaff, I dont believe he did it, he was removed afterwards. However its possible certain organisations act on their own without the generals permission. It does happen in the USA too, CIA at times acts independently.
I still cannot understand how TTP was so powerful and effective. Once a scholar issued a fatwa against TTP and TTP leader mentioned they will target him, so from Waziristan they planned it and excuted him in Lahore with a child suicide bomber. How can they be so powerful and effective, a mystery.