ISLAMABAD: The both houses of Parliament and four provincial assemblies are set to elect the 13th president of the country today in a three-way contest as the ruling party candidate, Dr Arif Alvi, is assured an easy win owing to failure of the opposition parties to field a joint candidate. br br As many as 1,121 legislators will cast their votes in the election to the top constitutional office of president. The polling will begin at 10:00 am and continue without break till 4:00pm.