Asif Ali Zardari leads the race to replace Musharraf in Saturday's presidential election.
Top parties missed a joint deadline Wednesday to reinstate judges deposed by President Musharraf.
Parliament is expected to confirm a new prime minister on Monday, further isolating Musharraf.
The opposition wins by a landslide in a surprisingly smooth election, as Musharraf allies concede defeat.
Her party is expected to do well in Feb. 18 parliamentary polls, analysts say.
An attack in Lahore, the first since Bhutto's assassination, raises fresh worries about security for Feb. 18 elections.