ISLAMABAD: As many as 470 seats of the national and provincial assemblies -- a significant 44 percent of the total-- will fall vacant if all the lawmakers belonging to the constituent parties of the Pakistan Democratic Movement tender their resignations as announced by the 11-party opposition alliance.The total strength of the national and four provincial assemblies comes to 1,070 legislators. Some six seats – two national and four provincial – are currently vacant, awaiting by-polls,...